Abundance-occupancy (A-O) patterns were explored temporally and spatially for the Georges Bank finfish and shellfish community to evaluate long-term trends in the assemblage structure and to identify anthropogenic and environmental drivers impacting the ecosystem. Analyses were conducted for 32 species representing the assemblage from 1963 to 2006 using data from the National Marine Fisheries S...

In this chapter, by using the orthogonally fixed point method, we prove Hyers–Ulam stability and hyperstability of 3-Lie homomorphisms for additive ρ-functional equation in algebras. Indeed, investigate system functional equations $$\displaystyle \begin{array}{@{}rcl@{}} \left \{ \begin {array}{ll} f(x+y)-f(x)-f(y)= \rho (2f\left (\frac {x+y}{2}\right )+ f(x)+ f(y)\right ),\\ f([[u,v],w])=[[f(u...

Collagen is the most abundant protein in animals. The protein consists of a helix of three strands, each with sequence X-Y-Gly. Natural collagen is most stable when X is (2S)-proline (Pro) and Y is (2S,4R)-4-hydroxyproline (4R-Hyp). We had shown previously that triple helices in which X is (2S,4S)-4-fluoroproline (4S-Flp) or Y is (2S,4R)-4-fluoroproline (4R-Flp) display hyperstability. This hyp...

This paper investigates the asymptotic hyperstability of a single-input–single-output closed-loop system whose controlled plant is time-invariant and possesses strongly strictly positive real transfer function that subject to internal external point delays. There are, in general, two controls involved, namely, one stabilizes with linear state feedback independent delay sizes belongs an hypersta...

For control of nonlinear sea plants such as ships and underwater vehicles nonlinear controllers based on artificial intelligence (fussy, neural, and neurofiizzy) are often introduced. They give a high control quality. Alas, it is very difficult or impossible to prove the stability for real systems with these controllers. Because technical regulations in many countries require stability proof be...

Motivation: This paper will discuss sensitivity issues in rotor speed estimation for induction machine (IM) drives using only voltage and current measurements. A supervised estimation algorithm is proposed with the aim to achieve good performances in the large variations of the speed. After a brief presentation on discrete feedback structure of the estimator formulated from d-q axis equations, ...

This paper presents a speed estimation technique for the permanent magnet synchronous motor drive. A Model Reference Adaptive System (MRAS) has been formed using the instantaneous and steady-state reactive powers to estimate the speed. It has been shown that such unique MRAS offers several desirable features. The proposed technique is completely independent of stator resistance and is less para...