Introduction ... . .. Conditions affecting' fish in rapid waters lVIodifications for life in hill-streams ... '[he external form ... 'l'he scale-:covering, etc. .e. '" ••• ::: The paired fins and the skeletal and Inuscular, structures connected therewith." ... 'fhe caudal fin and its peduncle .,. The mouth, its position ~ and shape; the jaws; the barbels i the lips and their muscles The eyes .....

The aim of this study was an analysis of the time required to swim to a victim and tow them back to shore, while perfoming the flutter-kick and the dolphin-kick using fins. It has been hypothesized that using fins while using the dolphin-kick when swimming leads to reduced rescue time. Sixteen lifeguards took part in the study. The main tasks performed by them, were to approach and tow (double ...

This paper describes preliminary experiments with an EAP (electroactive polymer) robot. The research reported here serves two purposes. First, we aim at building a testbed to investigate control methods of EAP actuators. Second, we wish to build an underwater robot that mimics undulating motions of pectoral fins. The prototype described in this paper has two pectoral fins. The tests confirm tha...

A submicroscale flow sensor has been developed that consists of a suspended hot film and carbon nanotube (CNT) fins. Flow measurement experiments, together with a theoretical model, revealed the advantages of the use of CNT fins. The suspended metal film reduces heat loss and the CNT fins enhance the heat transfer to the fluid flow. Herein, the working principle of the CNT fins is presented in ...

Abstract Satellite images frequently show mesoscale arc-shaped cloud lines with a spacing of several tens kilometers. These clouds form in shallow mixed boundary layer locations where the near-surface horizontal wind speed exceeds ~7 m s −1 . Unlike other line phenomena, such as convective rolls, these do not align direction but at large oblique angles to wind. A particularly distinct event thi...

The cichlid Hypsophrys nicaraguensis is a popular fish known as butterfly, and despite its widespread use as pets, little is known about its reproductive biology. In order to contribute to this knowledge, the study describes the relevant larval development characteristics, from adult and larval cultures in captivity. Every 12h, samples of larvae were collected and observed under the microscope ...

Numerical study of double-diffusive natural convective heat transfer in a curved cavity filledwith a porous medium has been carried out in the current study. Polar system has beenselected as coordinate system. As a result, all equations have been discredited in r and θdirections. Brinkmann extended Darcy model has been utilized to express fluid flow inporous matrix in the enclosure. Smaller and...