The evolutionary position of bichirs is disputed, and they have been variously aligned with ray-finned fish (Actinopterygii) or lobe-finned fish (Sarcopterygii), which also include tetrapods. Alternatively, they have been placed into their own group, the Brachiopterygii. The phylogenetic position of bichirs as possibly the most primitive living bony fish (Osteichthyes) made knowledge about thei...

An improved evacuated absorber tube (AT) design consisting of a semi-circular is proposed for large-aperture parabolic trough concentrator. The also contains flat-plate radiation shield in the vacuum part glass cover. To enhance heat transfer AT, different fins geometries added to bottom AT were analyzed here. Compared an without fins, thermal efficiency could be increased from 75.7% 76.9% with...

With about 24,000 extant species, teleosts are the largest group of vertebrates. They constitute more than 99% of the ray-finned fishes (Actinopterygii) that diverged from the lobe-finned fish lineage (Sarcopterygii) about 450 MYA. Although the role of genome duplication in the evolution of vertebrates is now established, its role in structuring the teleost genomes has been controversial. At le...

Adsorption refrigeration, being a unique and eco-friendly technology, has gained popularity over conventional refrigeration systems. The present study is aimed at developing an annular finned tube adsorber model which serves as thermal compressor in adsorption mathematical addressed numerically using finite difference discretization method explicit scheme was used for the solution. generalized ...

Compressed air is widely used in enterprises, and it possible to reduce consumption on pneumatic devices by heating. Most often, heating carried out shell-and-tube heat exchangers. To increase the area of exchange between medium air, finned tubes are used, which can significantly volume occupied heater. The design heater influenced many factors, importance influence each them differ significant...

Nowadays, with the development of technology and science, heat transfer holds an important place in engineering applications. In industrial areas, increases give rise to overheating, causing system errors. Passive techniques are frequently used prevent from such disruptions. this work, fins which passive provide high efficiency low cost were investigated. To improve transfer, finned structures ...