The present study aimed to compare the epithelium tissue of mucosa layer of
gastrointestinal tract in three types of lower vertebrates: Scyliorhinus canicula, Sparus
aurata, Salamandra infraimmaculata. The results of the histological and comparativ
e
study showed that the majority of digestion system parts were lined with simple
epithelium tissue while others were lined by pseudostratified epithelium tissue. Goblet
cells were distributed in all studied parts of digestion systems with density in some
locations. Esophagus was characterized by ciliated epithelium tissue, and the tubular
glands were presents in the stomach mucosa. Concerning the Lumina properia, it was
visible in all digestive system parts with some differences according to the animal species
studied.
With the increase in reliance on solar energy to produce electricity, so many maximum power point
tracking techniques for photovoltaic panels were developed to maximize the produced energy and a lot of
these are well established in the literature.
These techniques vary in many aspects such as: simplicity,
convergence speed, digital or analogical implementation, required sensors, cost, range of effectiveness, as
well as in other aspects.
This paper presents a comparative study of ten widely-adopted mppt algorithms; their performance is
evaluated from energy point of view using the simulation tool (Matlab), considering different solar
irradiance variations. Also, an economic evaluation has been made to make a comparison according to
performance and cost, to determine the optimal choice.
