Design of compact, lightweight, and robust heat recovery steam generators (HRSGs) is important for the implementation offshore bottoming cycles. In this work, a novel methodology integrating flow-induced vibration analysis proposed design optimization HRSG. The considers four main mechanisms, namely turbulent buffeting, vortex shedding, fluidelastic instability, acoustic resonance. correspondin...

Determining the phylogenetic relationship of two extant lineages of lobe-finned fish, coelacanths and lungfishes, and tetrapods is important for understanding the origin of tetrapods. We analyzed data sets from two previous studies along with a newly collected data set, each of which had varying numbers of species and genes and varying extent of missing sites. We found that in all the data sets...

The strength of selection to increase the span of a life stage is dependent upon individuals at that stage being able to contribute towards individual fitness and the probability of their surviving to that stage. Complete reproductive cessation and a long post-reproductive female lifespan as found in humans are also found in killer whale (Orcinus orca) and short-finned pilot whale (Globicephala...

As a member of the most basal clade of extant ray-finned fishes (actinopterygians) and of one of the most basal clades of osteichthyans (bony fishes + tetrapods), Polypterus can provide insights into the ancestral anatomy of both ray-finned and lobe-finned fishes, including those that gave rise to tetrapods. The pectoral fin of Polypterus has been well described but, surprisingly, neither the b...

Ray-finned fishes constitute the dominant radiation of vertebrates with over 32,000 species. Although molecular phylogenetics has begun to disentangle major evolutionary relationships within this vast section of the Tree of Life, there is no widely available approach for efficiently collecting phylogenomic data within fishes, leaving much of the enormous potential of massively parallel sequenci...

The marine fishes of the genus Selene are morphologically unique, although little is known about how these species are related to other members of the family Carangidae (Perciformes). In addition, questions remain about the potential validity of two putative species and how species groups with unique body forms within Selene are related. We used DNA sequences of the mitochondrial cytochrome b g...

The complete nucleotide sequence of the 16,407-bp mitochondrial genome of the coelacanth (Latimeria chalumnae) was determined. The coelacanth mitochondrial genome order is identical to the consensus vertebrate gene order which is also found in all ray-finned fishes, the lungfish, and most tetrapods. Base composition and codon usage also conform to typical vertebrate patterns. The entire mitocho...

The paper presents results of numerical and experimental analyses a fin-and-tube air-water heat exchanger. analysed device is one-row exchanger with finned elliptical tubes. aim the to investigate impact controlled non-uniform inflow air on performance. was modelled numerically using ANSYS Fluent program. developed model applied simulate operation in conditions uniform air. Cases an uncontrolle...

Each row of the heat exchanger (HEX) has different hydraulic-thermal characteristics. When air velocity upstream HEX is lower than approximately 3 m/s, exchanged flow rates at first rows tubes are higher average value for entire HEX. The article presents determination individual correlations air-side Nusselt numbers on each a 4-row finned with continuous flat fins and round in staggered tube la...