A new microprocessor based fuzzy maximum power point tracker (MPPT) for photovotaic applications under different thermal and insolation conditions is proposed. The photovoltaic system includes a solar panel, a fuzzy MPPT (to compute the optimal duty cycle) and a resistive load. Fuzzy controller input parameters are dP/dI and its variations (to improve accuracy) as well as the variation of a converter duty cycle (to improve dynamic characteristics). Theoretical and experimental results demonstrate fine performance as compared to the usual PV systems with direct connections of solar panel and load. The main contribution of this paper is the inclusion of temperature variations in the MPPT algorithm.

Introduction: Oxidative stress and neuroinflammation are involved in neurodegeneration procedure in Parkinson’s disease. Recently, neuroprotective potential of Boswellia resin has been demonstrated. Therefore, this study examined whether administration of Boswellia resin would attenuate MPP+-induced neuronal death in SK-N-SH- cell line, a human dopaminergic neurons- in vitro.Methods: Boswellia resin extract was added to culture medium (10 mg/ml) before and after exposure of SK-N-SH cell line to MPP+ (1000 mM). Cell viability and apoptosis features were assessed using MTT and Hoechst staining, respectively.Results: Treatment with Boswellia resin 2 and 3h prior to MPP o exposure and up to 60 minutes after MPP o exposure significantly increased cell viability compare to untreated cells. Apoptotic features were also reduced significantly by Boswellia resin (10 mg/ml) compare to that of control untreated cells.Discussion: Boswellia resin has neuroprotective effects on dopaminergic neurons which can be applicable in Parkinson’s disease.

Background: Porous absorbers are highly effective at attenuating high-frequency noise, yet they face inherent limitations, including reduced absorption at lower frequencies and vulnerability to environmental factors. Combining porous materials with Micro Perforated Panels (MPP) offers a solution but often sacrifices bandwidth. This study deals with optimizing parameters to extend the bandwidth toward higher frequencies, considering health concerns related to high-frequency noise exposure. Materials & Methods: This study used Finite Element Numerical Simulation (FEM) in COMSOL to model a porous material and MPP composite. It examined parameters like material thickness, air gap, hole diameter, panel thickness, MPP perforation percentage, and layer configurations. The goal was to find the best configuration to expand bandwidth, selecting and fixing the most effective parameter at each stage. Results: Findings from the simulated model aligned with direct impedance tube measurements. Enlargement of the fibrous material thickness, up to practical limits, expanded bandwidth. Optimizing MPP parameters involved minimizing hole diameter and panel thickness while maximizing perforations. The most effective layer configuration for bandwidth expansion consisted of an air layer, porous material, another air layer, additional porous material, and the MPP layer. Conclusions: Careful parameter selection can significantly increase bandwidth and absorption coefficients at higher frequencies. The incorporation of MPP enhances the composite's overall resilience, offering mechanical strength, resistance to environmental factors, and aesthetic appeal. The high precision of FEM simulations positions them as a valuable alternative to direct measurements such as impedance tube assessments. This study provides a comprehensive approach to improving porous absorber performance.