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Stan G.,University of Bucharest | Petcu D.,National Research and Development Institute for Textiles and Leather Division | Berijan G.,National Research and Development Institute for Textiles and Leather Division
Leather and Footwear Journal | Year: 2013

The medical literature defines posture by positioning and orientation of body segments relative to the direction of the gravitational field. Balance encompasses all static and dynamic actions performed by the body as a result of the interaction between postural control mechanisms in order to avoid falling. Maintaining a normal posture is a prerequisite for minimizing internal stress manifested in tissues. Stabilometry studies evolution, under static conditions, of the center of pressure, defined as the origin of the reaction force vector in relation to the support surface. The aging process or diseases such as diabetes, rheumatoid arthritis or pathomechanics, affecting posture by increasing instability and the risk of falls. There is medical evidence that demonstrates the positive effect of medical devices (orthopedic shoes or orthoses) on posture. An important role in prescribing and assessing the influence of medical devices on posture is that of stabilometry, namely assessing posture under static conditions. The article proposes to assess the main stabilometric parameters determined using AccuGait-AMTI force platform and to correlate them with technical characteristics of medical devices. Source


Gunduz O.,Marmara University | Yetmez M.,Bulent Ecevit University | Sonmez M.,Polytechnic University of Bucharest | Georgescu M.,National Research and Development Institute for Textiles and Leather Division | And 4 more authors.
Current Topics in Medicinal Chemistry | Year: 2015

Mesoporous materials synthesized in the presence of templates, are commonly used for environment and medical applications. Due to the properties it holds, mesoporous silica nanoparticles is an excellent material for use in medical field, biomaterials, active principles delivery systems, enzyme immobilization and imaging. Their structure allows embedding large and small molecules, DNA adsorption and genetic transfer. Using mesoporous silica nanoparticles for delivery of bioactive molecules can protect them against degradation under physiological conditions, allow controlled drugs release and minimize side effects on healthy tissues. Cellular tests performed on mesoporous silica nanoparticles demonstrate that MSN's cytotoxicity is dependent on the size and concentration and suggests the use of larger size nanoparticles is optimal for medical applications. Mesoporous materials possess high biological compatibility, are non-toxic and can be easily modified by functionalizing the surface or inside the pores by grafting or co-condensation method. The structure, composition and pores size of this material can be optimized during synthesis by varying the stoichiometric reactants, reaction conditions, nature of the template’s molecules or by functionalization method. © 2015 Bentham Science Publishers. Source


Ficai M.,National Research and Development Institute for Textiles and Leather Division | Stan A.,National Institute of Aerospace Research Elie Carafoli | Georgescu M.,National Research and Development Institute for Textiles and Leather Division | Vilsan M.,National Research and Development Institute for Textiles and Leather Division
Proceedings of the 3rd International Conference on Advanced Materials and Systems, ICAMS 2010 | Year: 2010

In the competition of polymer compounds new improvements have recently been developed in the synthesis of elastomers and polyolefins, in their processing in the presence of high-performance reinforcing materials, with preset properties. Due to the fact that styrene-butadiene elastomer does not crystallize by stretching, in the absence of active charges most often it exhibits unsatisfactory properties. Polymer structures based on styrene-butadiene rubber have been done on a laboratory roll with heating possibility, Brabender type, by incorporating different types and quantities of reinforcing agents in the form of grains or powders with nano structure and chemically activated surfaces as well as by using numerous auxiliary materials with well-determined role in influencing properties of finished products or price. From the blend obtained on the roll samples of various sizes have been taken and vulcanized in the form of plates, in the electric press at time values established after rheological testing. As a result of physical-mechanical testing, it could be noticed that the presence of reinforcing agents induces significant improvements of physical-mechanical characteristics of polymer structures, compared to reference materials, and technological processability of the new materials being much improved (density of compounds increases proportionally to the increase of charge content, the values of hardness vary in considerable proportions in relation to reference values (from 42 to 63°Sh A) depending on the type of charge used to make the compounds). These data are confirmed in all types used. Source


Sonmez M.,National Research and Development Institute for Textiles and Leather Division | Georgescu M.,National Research and Development Institute for Textiles and Leather Division | Valsan M.,National Research and Development Institute for Textiles and Leather Division | Radulescu M.,Polytechnic University of Bucharest | And 4 more authors.
Journal of Applied Polymer Science | Year: 2015

In this article, polymer composites based on polypropylene (PP) matrix reinforced with short glass fibers type E (GF-type E) were obtained. However, to ensure good interfacial adhesion and stress transfer across the interface, the influence of the chemical functionalization of the phases was analyzed. The better interfacial adhesion is assured by the use of maleic anhydride grafted PP and amino-functionalized GF. The obtained composite materials were tested from the point of view of composition, morphology, and mechanical properties. It can conclude that the chemical functionalization of the two phases is beneficial from the point of view of compatibility of the phases and consequently higher mechanical properties are obtained. © 2015 Wiley Periodicals, Inc. Source

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