Crystalline silicon was obtained from the ash of wheat (husk and spike), which was fertilized by a system of controlled release of urea. The method used was a thermal reduction (550 °C, 650 °C and ...750 °C). Temperature (TGA), morphological (SEM-EDX), FTIR, XRD, and RAMAN characterizations were performed. Silicon was used to build a solar cell with this configuration ITO/CdS/Si/CP/Au, which was characterized by J-V curves. In the present work, we obtained highly crystalline silicon, which could be used for energy generation at low temperatures of magnesium-reduction. The increase of silica in wheat could be attributed to the type of fertilization. We are using an environmentally friendly system due to the reduction reaction to silicon from the ashes of what is feasible to contribute to clean energy generation at a low cost.
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In the present work, polylactic acid (PLA), elastin and gelatin fibers, containing clindamycin, were prepared to test their potential application as wound dressings. They underwent release studies to ...determine the mechanism of drug release through mathematical models. The fibers have a homogeneous morphology, without pores. The studies of FTIR and thermal analysis corroborate the presence of each of the components in the fibers; the results of the feasibility tests showed encouraging percentages with a viability of 82% after 7 days of direct contact of the HUVEC cells with the membranes. Similarly, cell adhesion assays show the presence of viable and stretched cells on the fibers, the tendency of the cells to position themselves on the fibers and follow this conformation was observed. On the other hand, studies of antimicrobial activity against
S. aureus
show us that in fibers loaded with clindamycin they have inhibition halos greater than 8 mm.
Necessary conditions for the controllability on linear systems with positive control are presented. The real case is analyzed and the Jordan form representation is employed. The minimum number of ...necessary controls to obtain controllability is remarked.
