Over the past 50 years, most efforts to regulate fishing and conserve our oceans have had limited success in preventing overfishing, degradation of the marine environment, and irreversible loss of marine biodiversity. Ecosystem-based management (EBM) of the oceans is an approach that is likely to succeed where many other initiatives have failed, because of its focus on managing human issues and...

We study a stochastic control system, described by Ito’s controllable equation, and evaluate the solutions by an entropy functional (EF), defined by the equation’s functions of controllable drift and diffusion. Considering a control problem for this functional, we solve the EF control’s variation problem (VP), which leads to both a dynamic approximation of the process’ entropy functional by an ...

Abstract Grain size and shape are important yield indicators. A hint for reexamining the visual markers of grain weight can be found in wheat width. digital vernier caliper is used to measure length, width, thickness. The data consisted 1296 grains, with measurements each grain. In this set, average (We) twenty-four grains was measured recorded. To determine length (L), width (W), thickness (T)...

magnetic field effect on unsteady natural convection heat transfer of cu–water nanofluid in a square porous cavity was studied numerically in here. at first, initial temprature of the cavity was and vertical walls were at temprature . suddenly the right wall's tamprature was changed to and the horizontal walls were adiabatic. the effective parameters in this study were ra , ha, and . which appe...

We study color confinement properties of the multi-instanton system, which seems to carry an essence of the nonperturbative QCD vacuum. Here we assume that the multi-instanton system is characterized by the infrared suppression of instantons as f (ρ) ∼ ρ −5 for large size ρ. We first investigate a monopole-clustering appearing in the maximally abelian (MA) gauge by considering the correspondenc...

We develop a framework and numerical method for controlling the full space-time tube of geometrically driven flow. consider an optimal control problem mean curvature flow curve or surface with volume constraint, where parameter acts as forcing term in motion law. The trajectory is achieved by minimizing appropriate tracking-type cost functional. gradient functional obtained via formal sensitivi...