Results 41 to 50 of about 375,371 (287)

Basic Properties and Stability of Fractional-Order Reset Control Systems

, 2013
Reset control is introduced to overcome limitations of linear control. A reset controller includes a linear controller which resets some of states to zero when their input is zero or certain non-zero values.
HosseinNia, S. Hassan, Tejado, Inés, Vinagre, Blas M   +2 more
core   +1 more source

Adaptive Backstepping Control for Fractional-Order Nonlinear Systems with External Disturbance and Uncertain Parameters Using Smooth Control

, 2020
In this paper, we consider controlling a class of single-input-single-output (SISO) commensurate fractional-order nonlinear systems with parametric uncertainty and external disturbance.
Li, Xinyao, Wen, Changyun, Zou, Ying
core   +1 more source

Sequence determinants of RNA G‐quadruplex unfolding by Arg‐rich regions

FEBS Letters, EarlyView.
We show that Arg‐rich peptides selectively unfold RNA G‐quadruplexes, but not RNA stem‐loops or DNA/RNA duplexes. This length‐dependent activity is inhibited by acidic residues and is conserved among SR and SR‐related proteins (SRSF1, SRSF3, SRSF9, U1‐70K, and U2AF1).
Naiduwadura Ivon Upekala De Silva, Puspa Kunwar, Md Ibnul Rifat Rahman, Joanna Koryo Kwao, Nathan Lehman, Zihan Zhang, Trenton Paul, Claire Cheng, Nicholas Truex, Hui‐Ting Lee, Jun Zhang   +10 more
wiley   +1 more source

Frequency Control of Interlinked Microgrid System Using Fractional Order Controller

Electrica
As renewable energy resource (RES) penetration levels increase within a grid, power networks become more vulnerable to low inertia issues. Additionally, the proliferation of electric vehicles (EVs) has already made a substantial impact on grid dynamics ...
Dharmesh Kumar, Vijay P. Singh, M. A. Mallick   +2 more
doaj   +1 more source

Control Techniques for a Class of Fractional Order Systems

Mathematics, 2021
The paper discusses several control techniques for a class of systems described by fractional order equations. The paper presents the unit frequency criteria that ensure the closed loop control for: Fractional Order Linear Systems, Fractional Order ...
Mircea Ivanescu, Ioan Dumitrache, Nirvana Popescu, Decebal Popescu   +3 more
doaj   +1 more source

Optimal control of fractional semilinear PDEs

, 2019
In this paper we consider the optimal control of semilinear fractional PDEs with both spectral and integral fractional diffusion operators of order $2s$ with $s \in (0,1)$.
Antil, Harbir, Warma, Mahamadi
core   +1 more source

A Conformal Mapping Based Fractional Order Approach for Sub-optimal Tuning of PID Controllers with Guaranteed Dominant Pole Placement [PDF]

, 2012
A novel conformal mapping based Fractional Order (FO) methodology is developed in this paper for tuning existing classical (Integer Order) Proportional Integral Derivative (PID) controllers especially for sluggish and oscillatory second order systems ...
Das, Saptarshi, Das, Shantanu, Gupta, Amitava, Saha, Suman   +3 more
core   +2 more sources

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

Control quality enhancement by fractional order controllers [PDF]

Acta Montanistica Slovaca, 1998
Príspevok sa zaoberá regulátormi neceločíselného rádu. Uvádza matematický popis neceločíselných regulátorov a metódy ich návrhu. Kvalita a robustnosť regulátorov neceločíselného rádu je porovnaná s klasickými celočíselnými regulátormi.
Koštial Imrich, Dorčák Ľubomír, Petráš Ivo   +2 more
doaj  

Control and Robust Stabilization at Unstable Equilibrium by Fractional Controller for Magnetic Levitation Systems

Fractal and Fractional, 2021
The problem of control and stabilizing inherently non-linear and unstable magnetic levitation (Maglev) systems with uncertain equilibrium states has been studied.
Banu Ataşlar-Ayyıldız, Oğuzhan Karahan, Serhat Yılmaz   +2 more
doaj   +1 more source