The grafting of monochlorotriazinyl-β-cyclodextrin on cellulosic hemp materials provides hosting cavities that can include a large variety of chemicals for specific antimicrobial finishing. The yarns obtained after processes with simultaneous phases of wet-spinning and grafting have adequate physico-mechanical characteristics. The monochlorotriazinyl-β-cyclodextrin solution causes an increasing of hemp fibers adherence leading to yarns tenacities and elongations enhancing. Four compounds (ferulic acid, caffeic acid, ethyl ferulate and allantoin) have been included into the cavities of monochlorotriazinyl-β-cyclodextrin grafted on hemp fibers. The included derivatives have been characterized by infrared spectroscopy tests which have confirmed that the included components are efficiently hosted in the cyclodextrin nanocavities. The antimicrobial properties of the samples were evaluated by microbiological analysis which has shown that the sanogenetic properties of the hemp fibers are significantly modified by the chemical treatments.
In this study we present the way in which the monochlorotriazinyl-β-cyclodextrin can be grafted on to bast fibers simultaneously with their wet spinning. The modeling of the process was realized by mechanical and chemical processing at different wet spinning-grafting parameters (concentration of β-cyclodextrin and speed of the material in the impregnation stage). The neural modeling of the studied process constitutes the main objective of this paper. In order to obtain physico-mechanical characteristics adequate for a bleached hemp yarn and an optimum grafting degree for the ulterior inclusion operation, it is necessary to establish a soaking time between 20 and 30 s and a solution concentration of 60 g/l monochlorotriazinyl-β-cyclodextrin.
The ankle structure holds one of the most important role in the human biomechanics. Due to complexity of everyday activities this joint is the most prone to be injured part of the lower limb. For a complete recovery of the locomotor function, recovery exercises are mandatory. The existent ankle rehabilitation equipments allow only simple rehabilitation exercises, which cannot be used safely without the aid of a therapist. The introduction of robotic physical recovery systems represents a modern alternative to traditional recovery. Actuated devices are advantageous because they allow many types of exercises on same device, and also they accurate measure forces and angular motions. The purpose of this two paper is to propose a simple rehabilitation device, based on a one-degree-of-freedom mechanisms. Some structural, kinematic and designing aspects of this new ankle rehabilitation device are presented.
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