Results 41 to 50 of about 462 (161)

An Adaptation Mechanism of Model Reference Adaptive System Based on Variable Structure Control for Online Parameter Estimation of IPMSM

IET Control Theory &Applications, Volume 20, Issue 1, January/December 2026.
ABSTRACT This study introduces stator currents‐based model reference adaptive system (MRAS) estimators that employ variable structured control (VSC) in the adaptation mechanism to enable the online estimation of stator resistance and permanent magnet (PM) flux in interior permanent magnet synchronous motors (IPMSMs).
Ertugrul Ates, Burak Tekgun, Murat Barut
wiley   +1 more source

Performance Improvement of PMSG‐Based Wind Energy Systems via Sensorless FS‐Predictive Current Control With MRAS and MPPT‐OTC Integration

IET Electric Power Applications, Volume 20, Issue 1, January/December 2026.
This paper proposes a hybrid sensorless control strategy for a permanent magnet synchronous generator (PMSG)‐based wind energy conversion system (WECS). The approach integrates finite‐set predictive current control (FS‐PCC), a model reference adaptive system (MRAS) estimator and an optimal torque control maximum power point tracking (MPPT‐OTC) method ...
Hicham Sayhi, Amor Bourek, Abdelkarim Ammar, Ali Teta, Ahmed Chennana, Abdelaziz Rabehi, Mohamed Benghanem, Takele Ferede Agajie   +7 more
wiley   +1 more source

Some Remarks Concerning the General Octic Functional Equation

Journal of Mathematics, 2023
In this article, we study the stability of various forms for the general octic functional equation ∑i=099Ci−19−ifx+iy=0. We first find a special way of representing a given mapping as the sum of eight mappings.
Yang-Hi Lee, Jaiok Roh
doaj   +1 more source

Hyperstate matrix models: extending demographic state spaces to higher dimensions

Methods in Ecology and Evolution, 2016
Summary Demographic models describe population dynamics in terms of the movement of individuals among states (e.g. size, age, developmental stage, parity, frailty, physiological condition). Matrix population models originally classified individuals by a single characteristic.
Roth, G., Caswell, H.
openaire   +3 more sources

Mystery of the Disappearing Dogfish: Transboundary Analyses Reveal Steep Population Declines Across the Northeast Pacific With Little Evidence for Regional Redistribution

Fish and Fisheries, Volume 27, Issue 1, Page 1-12, January 2026.
ABSTRACT Quantifying broad‐scale population trends and distribution change is critical for effective management and conservation of marine species, particularly under climate change. However, fragmented regional survey data often hinder such efforts for transboundary populations. A prime example is Pacific Spiny Dogfish (Squalus suckleyi, Squalidae), a
Lindsay N. K. Davidson, Philina A. English, Jackie King, Paul B. C. Grant, Ian G. Taylor, Lewis A. K. Barnett, Vladlena Gertseva, Cindy A. Tribuzio, Sean C. Anderson   +8 more
wiley   +1 more source

Hyperstable, Minimal‐Length, and Blunt‐Ended Collagen Heterotrimers

Angewandte Chemie, Volume 137, Issue 29, July 14, 2025.
The selective assembly of the most stable and the shortest non‐covalently assembled collagen heterotrimer to date was achieved. In addition, the first blunt‐ended collagen triple helix and heterotrimers with defined strand overhangs were developed.
Tomas Fiala, Philipp Bittner, Rahel Heeb, Valdrin Islami, Carolina Söll, Adam Pruška, Renato Zenobi, Helma Wennemers   +7 more
wiley   +2 more sources

Hyperstability of the k-Cubic Functional Equation in Non-Archimedean Banach Spaces

Journal of Mathematics, 2020
Using the fixed point approach, we investigate a general hyperstability results for the following k-cubic functional equations fkx+y+fkx−y=kfx+y+kfx−y+2kk2−1fx, where k is a fixed positive integer ≥2, in ultrametric Banach spaces.
Youssef Aribou, Mohamed Rossafi
doaj   +1 more source

Stability and Superstability of a Linear Functional Equation on Restricted Domains

Journal of Function Spaces, Volume 2026, Issue 1, 2026.
This paper investigates the Hyers–Ulam stability and superstability of the functional equation f(x2 + yf(z)) = xf(x) + zf(y) for real‐valued functions f : R⟶R on some restricted subsets of R.
Abbas Najati, Mohammad Amin Tareeghee, Themistocles M. Rassias, Arnab Biswas   +3 more
wiley   +1 more source

Representation of Multilinear Mappings and s‐Functional Inequality

Journal of Mathematics, Volume 2026, Issue 1, 2026.
In the current research, we introduce the multilinear mappings and represent the multilinear mappings as a unified equation. Moreover, by applying the known direct (Hyers) manner, we establish the stability (in the sense of Hyers, Rassias, and Găvruţa) of the multilinear mappings, associated with the single multiadditive functional inequality.
Abasalt Bodaghi, Pramita Mishra
wiley   +1 more source

Stability analysis of q-axis rotor flux based model reference adaptive system updating rotor time constant in induction motor drives

CES Transactions on Electrical Machines and Systems, 2017
q-axis rotor flux can be chosen to form a model reference adaptive system (MRAS) updating rotor time constant online in induction motor drives. This paper presents a stability analysis of such a system with Popov's hyperstability concept and small-signal
Shuying Yang, Pengpeng Cao, Xing Zhang
doaj   +1 more source