scholarly journals An underwater observation dataset for fish classification and fishery assessment

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Erin McCann ◽  
Liling Li ◽  
Kevin Pangle ◽  
Nicholas Johnson ◽  
Jesse Eickholt
Keyword(s):  
Underwater Observation

Motion Estimation byUsing Stereo Vision Analysis For Underwater Observation System

2019 ◽  
Author(s):  
Masyhuri Husna Binti Mazlan ◽  
Morisawa Daisuke ◽  
Koike Yoshikazu ◽  
Shimizu Junji ◽  
Enomoto Eriko ◽  
...  
Keyword(s):  
Motion Estimation ◽  
Stereo Vision ◽  
Observation System ◽  
Underwater Observation

Underwater Observation and Photography of Flow Phenomena Through Glass Panels in a Ship's Hull

Nature ◽  
1952 ◽  
Vol 169 (4313) ◽  
pp. 1074-1076
Author(s):  
J. W. FISHER
Keyword(s):  
Underwater Observation ◽  
Flow Phenomena ◽  
Glass Panels

scholarly journals Microhabitat use by Phalloceros harpagos Lucinda (Cyprinodontiformes: Poeciliidae) from a coastal stream from Southeast Brazil

2011 ◽  
Vol 9 (3) ◽  
pp. 665-672 ◽  
Author(s):  
Rosana Mazzoni ◽  
Vitor Considera Novaes ◽  
Ricardo Iglesias-Rios
Keyword(s):  
Water Column ◽  
Water Velocity ◽  
Microhabitat Use ◽  
Mato Grosso ◽  
River Bank ◽  
Underwater Observation ◽  
Electivity Index ◽  
Southeast Brazil ◽  
Stream Bank ◽  
Vegetal Cover

The size-related microhabitat use of Phalloceros harpagos Lucinda, 2008 from Mato Grosso stream (Saquarema - RJ) was examined. We analyzed, during 8.3 h of underwater observation, a 200 m long reach in the upper Mato Grosso stream, quantifying the following microhabitat descriptors: (i) distance from the stream bank, (ii) water column depth, (iii) occurrence on riffle, pool or run mesohabitat, (iv) water velocity, (v) substratum, and (vi) subaquatic vegetal cover. Microhabitat selectivity was analyzed by comparing the microhabitat used by fish and the microhabitat available in the study site. Complementary analyses, based in the Ivlev Electivity Index were applied in order to test selectivity for the microhabitat use. We did not found differences in the microhabitat used by juvenile and adult individuals. Phalloceros harpagos was selective for five among the six analyzed microhabitat descriptors. The occurrence of Phalloceros in the studied stream was limited to shallow pools, close to the river bank, with low water velocities and mud substratum. Vegetal cover was not an important factor in the occurrence of the studied species.

scholarly journals New records and underwater observation of the rare fishScorpaenodes arenai(Osteichthyes: Scorpaenidae) from the central and western Mediterranean Sea

2015 ◽  
Vol 82 (3) ◽  
pp. 454-458 ◽  
Author(s):  
P. Battaglia ◽  
S. Canese ◽  
G. Ammendolia ◽  
T. Romeo ◽  
R. Sandulli ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
New Records ◽  
Western Mediterranean ◽  
Underwater Observation ◽  
Western Mediterranean Sea

A Structural Analytical Method of Underwater Observation Tower Due to Breaking Wave Forces

2006 ◽  
Author(s):  
Osamu Saijo ◽  
Hiroaki Eto
Keyword(s):  
Structural Design ◽  
Wave Breaking ◽  
Elastic Vibration ◽  
Wave Forces ◽  
Breaking Wave ◽  
Underwater Observation ◽  
Rigid Frame ◽  
Rotational Shell ◽  
Inside Wall ◽  
Breaking Wave Forces

A structural design of the underwater observation tower constructed at wave breaking zone was studied in this research. Though the under water observation tower seems to be a rotational shell structure from its shape, actually, the rigid frame of beams and ribs exits inside wall, in which the frames are covered with curved plate element firmly against seawater pressure. Assuming that the observation tower was a pseudo-cylindrical shell, two results through our conducted research were applied for a practical structural analysis of the underwater observation tower. One is the unique and simple formula on added mass depending on elastic vibration, the other is transformation of total breaking wave forces into the wave pressure distribution over the surface of the observation tower. Using those results, the structural characteristic concerning displacement of the under water observation tower was examined through our own results.

scholarly journals Body Design Concept of Remotely Operated Vehicle (ROV) of Observation Class with the Method of Concept Screening and Concept Scoring

2018 ◽  
Vol 218 ◽  
pp. 02009 ◽  
Author(s):  
Dhimas Satria ◽  
Dovan Pujangga Asmara Lanank Esiswitoyo ◽  
Ni Ketut Caturwati ◽  
Erny Listijorini ◽  
Rina Lusiani
Keyword(s):  
Design Concept ◽  
Relative Performance ◽  
The Other ◽  
Concept Selection ◽  
Remotely Operated Vehicle ◽  
Underwater Observation ◽  
Streamlined Body ◽  
Design Structure ◽  
Body Design ◽  
Initial Concept

The Remotely Operated Vehicle (ROV) underwater observation equipment has previously been developed, but it had restriction for not being hydrodynamic still due to the unique conditions of the Sunda Strait waters. This study aims to further develop the previously developed ROV by improving the design structure of the ROV body. The method of design concept selection used was concept screening and concept scoring. In concept screening, the initial concept was evaluated relatively to the same preferences using screening matrices. On the other hand the Concept Scoring was conducted by determining the relative performance value which was the assessment used to evaluate how the comparison between concepts and number as the comparison. The result of the study obtained the selected design concept, which was small ROV with streamlined / half-streamlined body geometry which had rear-middle rotor configuration as motion component of hydrodynamic 3 DOF (surge, heave, and yaw).

Underwater Observation under Intellectual Interference

2018 ◽  
Vol 1 (92) ◽  
pp. 31-41 ◽  
Author(s):  
L. A. Martynova ◽  
Keyword(s):  
Underwater Observation
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