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Sulea D.,University of Bucharest | Albu M.G.,Leather and Footwear Research Institute | Ghica M.V.,Carol Davila University of Medicine and Pharmacy | BraZdaru L.,University of Bucharest | And 2 more authors.
Revue Roumaine de Chimie | Year: 2011

Porous collagen matrices containing chlorhexidine digluconate (CHXD) were obtained by freeze-drying of three series of 1.1% collagen hydrogels having the pHs 3.8, 7.4 or 7.4 plus 0.15% glutaric aldehyde (GA) reported to the collagen from hydrogel, each series containing 0, 0.02, 0.05 or 0.10% CHXD reported to the amount of gel. FT-IR spectra show that freeze drying, pH, CHXD or/and GA do not affect the triple helical conformation of collagen molecules forming fibrils. CHXD increases a bit the crosslinking of matrices obtained from acid hydrogels irrespective of its concentration, while of those resulted from slight basic ones is reduced to a slight extent in the absence of GA and much more in its presence, which means that the crosslinking decreases with CHXD concentration increase due to its reaction with the carboxyl groups of collagen and GA respectively. Matrices' morphology reflects the changes produced in hydrogels by CHXD and/or GA: those obtained from acid hydrogels have lamellar structure, which becomes denser with increasing of CHXD concentration, orientation disappears in the matrices obtained from slight basic hydrogels, CHXD p oduces the agglomeration of fibrils that increases with CHXD concentration and GA enhances it. In the matrices containing 0.1% C XD a part of it separates due to the regression of its solubility in basic media. The amounts of CHXD released from the matrices increase with CHXD concentration irrespective of pH and GA presence. The lowest amounts are released by the matrices obtained from the hydrogels with acid medium and the highest ones from the non-crosslinked matrices obtained from hydrogels with slight basic pH containing 0.1% CHXD. Source

Craciun G.,National Institute for Laser, Plasma and Radiation Physics | Manaila E.,National Institute for Laser, Plasma and Radiation Physics | Stelescu M.D.,Leather and Footwear Research Institute
Journal of Chemistry | Year: 2016

The purpose of the paper is to present the synthesis and characterization of hydrogels prepared by free-radical copolymerization of acrylamide and acrylic acid in aqueous solutions using potassium persulfate as initiator and trimethylolpropane trimethacrylate as cross-linker, via the radiation technique. The samples were subjected to electron beam treatment in the dose range of 2 to 4 kGy and the influence of the absorbed dose and amount of cross-linker on the swelling properties, diffusion coefficient, and network parameters of hydrogels was investigated. A possible reaction mechanism for acrylamide/acrylic acid/trimethylolpropane trimethacrylate hydrogels was also suggested. The structure and morphology of hydrogels were characterized by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. © 2016 Gabriela Craciun et al. Source

Guta S.-A.,Leather and Footwear Research Institute | Dumitrache I.,Polytechnic University of Bucharest | Ioannidis I.,ME MED Consultants for Leather Industry
Journal of the Society of Leather Technologies and Chemists | Year: 2015

Experts share their views on the emergence of the smart tannery enterprise. They present a multi-agent architecture for leather processing control, along with a case study that simulates the behavior of the multi-agent TANMAS@ architecture in dealing with the control of leather processing to justify their views on the smart tannery enterprise. They state that the existing current automation systems must operate in complex, unpredictable environments which consists of a wide range of manufacturing resources distributed across a large geographic area. Source

Vasilescu A.M.,Leather and Footwear Research Institute | Micu A.C.,Polytechnic University of Bucharest | Bogatu L.,Polytechnic University of Bucharest
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2011

Ground reaction force occupies an important place in the overall context of human motion analysis. The body's reaction to changes in footwear-whether they are shoe modifications and inserts or orthopedic corrections-depends on the time period within which a particular type of footwear is used. In fact, the biomechanical effects of changes in footwear must be differentiated according to the time needed for the body to adapt to these changes. The purpose of this study was to determine the ground reaction force depending on the characteristics of the materials used for the sole in normal gait on different types of ground surfaces. Source

Pop M.,Leather and Footwear Research Institute
Proceedings of the 4th International Conference on Advanced Materials and Systems, ICAMS 2012 | Year: 2012

The foray into structures of artistic image in environmental decorative arts aims, on the one hand, at the comparative analysis of artistic discourse in three different registers of expression: the decorative and the plastic register, and on the other hand, it aims to identify the icono-plastic sign as carrier of the archetypal message, in two distinctive types of logos: poetic and narrative. The third register of expression is the material one, defined by artistic technologies. Aesthetic interpretation stays in the area of deciphering the artistic message, mostly symbolic, while semiotic analysis aims to decipher the inner mechanisms of the image, and the artistic imagination, defining icono-plastic signs. Undertaking the materialization of the work, throughout the whole trajectory of achieving the decorative cultural product, is called artistic technology. It is a creative technology at the conceptual level, but framed within technical steps to achieving the environmental decorative product, which are very clearly defined as technological operations. Coming out of the major area of aesthetics and subjected to semiotic analysis, the artistic image transgresses, in theory, from a harmonic matrix of analysis, specific to aesthetics, into an expressive matrix, specific to discourse analysis, visual rhetoric. The whole approach, as well as the result of semiotic analysis of a decorative art project idea, will lead, step by step, to outlining an artistic technology, which becomes itself part of the cultural product symbolics, a technological style thus emerging. Artistic technology analyzed in terms of semiotics, which is the subject of the case study for the "Red apple" project is leather embroidery, industrially manufactured. The purpose of the whole scientific endeavor is to shape the guidelines of a framework artistic technology to further develop a number of artistic products with cultural identity, for modern domestic environmental spaces: private homes with determined environmental design or public spaces: institutions, libraries, airports etc. Source

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