This study evaluates the relationship between both commercial and scientific spatial fisheries data a new satellite-based estimate of potential fish production (Ocean Productivity available to Fish, OPFish) in European Seas. To construct OPFish, we used productivity frontal features derived from chlorophyll-a horizontal gradients, which characterize 10%–20% global phytoplankton that effectively...

Interactions between fishing and dolphins can be detrimental, since on one hand lethally entangled by nets trawls, the other predate fish caught nets. For dolphins, this interaction dangerous as they wounded or accidentally killed; for fishers, predation of their catch results in economic losses due to reduced quantity and/or quality catches damage gear. During July November 2020, we surveyed “...

By-catch is the most significant direct threat marine megafauna face at global scale. However, magnitude and spatial patterns of by-catch are still poorly understood, especially in regions with very limited monitoring expanding fisheries. The Indian Ocean a globally important region for biodiversity tuna fisheries, but has data. Anecdotal scattered information indicates high could be major thre...

1. Abstract The realistic investigation of the real behavior of the most important machine elements (gears, flexible drives, clutches, rolling and hydrodynamic bearings, etc) needs the application of several disciplines during the analysis process (contact mechanics, elasticity, fluid flow, heat exchange, noise propagation, for mechatronic elements the consideration of the effects of magnetic f...

With the rapid rise in interest in microand nano-mechanical and electromechanical devices it will soon be necessary to consider the quantum aspects of the behaviour of such mechanical devices in the same way as the development of microand nano-scale electronic devices forces us to consider quantum finite size and interference effects as well as single electron effects (Drexler 1992, Cleland & R...

In book 1 Thucydides’ Corinthians attribute Athenian military success in the Archidamian war to an inherent national character. They empahsize the characteristics of agility, speed, and common-good seeking. Thucydides’ readers come to realize that the Athenian “democratic advantage” stemmed from a superior capacity to organize useful knowledge. Knowledge management in military affairs can be le...

Understanding the geometry of gears with skew axes is a complex task, hard to grasp and to visualize. However, due to Study’s Principle of Transference, the geometric treatment based on dual vectors can be readily derived from that of the spherical case. This paper is based on Martin Disteli’s work and on the authors’ previous results where Camus’ concept of an auxiliary curve is extended to th...

This paper investigates the ecological-economic sustainability of coral reef socio-ecological systems under fishing and environmental pressures. To achieve this, a dynamic, spatially explicit, multi-species, multi-fleet fisheries model is developed. Stochastic shocks are assumed to alter cover consequently entire social-ecological system. The calibrated using ecological, socio-economic data in ...

The length-weight relationship (LWR) and relative condition factor for the two freshwater fish species, malabar sprat, Ehirava fluviatilis quoy’s garfish, Hyporhamphus quoyi were estimated from potamon zone of Thamirabarani river, Eastern Slope Western Ghats, Southern Tamil Nadu, India. Fish samples caught fortnightly using various fishing gears viz., cast net seine between November 2020 Octobe...

We investigated whether people can use analog imagery to model the behavior of a simple mechanical interaction. Subjects saw a static computer display of two touching gears that had different diameters. Their task was to determine whether marks on each gear would meet if the gears rotated inward. This task added a problem of coordination to the typical analog rotation task in that the gears had...