Results 21 to 30 of about 1,017,685 (293)

A Stability Study by Routh-Hurwitz Criterion and Gershgorin Circles for Covid-19 [PDF]

open access: yesModeling, Identification and Control
In this paper, we study stabilization problem on a model for covid-19 by using Routh-Hurwitz criterion and Gershgorin circles. Using Routh-Hurwitz criterion, we prove the necessity of unstability and stability conditions for the model that we extend from
Bedia Akyar   +2 more
doaj   +1 more source

Modeling of halal supplier flexibility criteria in the food supply chain using hybrid ISM-MICMAC: A dynamic perspective

open access: yesCogent Engineering, 2023
In the context of the halal supply chain, the need for flexibility of halal suppliers is increasing along with changes in regulations, policies, markets, and technology that change dynamically.
Dwi Iryaning Handayani   +3 more
doaj   +1 more source

Multiple ellipse fitting by center-based clustering

open access: yesCroatian Operational Research Review, 2015
This paper deals with the multiple ellipse fitting problem based on a given set of data points in a plane. The presumption is that all data points are derived from k ellipses that should be fitted.
Tomislav Marošević, Rudolf Scitovski
doaj   +1 more source

Numerical simulation on the thermal performance enhancement of energy storage tank with phase change materials

open access: yesJournal of Thermal Science and Technology, 2019
The model of the energy storage tank based on multiple tubes with phase change material was established. The influence of the tube circle diameter and the inner annulus temperature on the heat storage performance of the tube bundle in the concentric ...
Yang TIAN, Ming ZHAO
doaj   +1 more source

Circle Criterion for Multi-Order Fractional System Control

open access: yesFractal and Fractional
The paper investigates the asymptotic stability for the control of systems described by multi-order fractional differential equations. By utilizing generalized Lyapunov functions and the Kalman–Yakubovich–Popov lemma, frequency-domain criteria are ...
Mircea Ivanescu   +2 more
doaj   +1 more source

Analysis on Loose Circle of Surrounding Rock of Large Deformation Soft-Rock Tunnel

open access: yesAdvances in Civil Engineering, 2020
With the rapid development of tunnel construction in China, deep buried and long tunnel projects are emerging in areas with complex engineering geological conditions and harsh environment, and thus large deformation of tunnels under conditions of high in
Rui Wang   +5 more
doaj   +1 more source

Mathematical Model of Landslides with Curved Sliding Plane Using Fracture Criterion of Solid Soil-Rock System

open access: yesScience and Technology Indonesia, 2022
Alluvial cliff with high slope and step has been known to cause curving sliding plane. This phenomenon is adopted as a knowledge, but it has never been studied theoretically.
Ikah Ning Prasetiowati Permanasari   +2 more
doaj   +1 more source

Gershgorin-Circle Based Low-Complexity Generalized Nyquist Stability Criterion for DFIG Driven Wind Turbines [PDF]

open access: yes, 2022
Recently, the stability issue caused by interactions between the doubly-fed induction generator (DFIG)-based wind turbines (WTs) and weak grids has attracted great concerns.
Wu, Han   +9 more
core   +1 more source

Frequency-Domain Asymptotic Synchronization Criteria for Delayed Fuzzy BAM Neural Networks Under Novel Controllers

open access: yesMathematics
This paper studies the asymptotic synchronization problem for drive-response delayed fuzzy bidirectional associative memory (BAM) neural networks via a frequency-domain approach.
Zhiying Cheng, Zhen Yang
doaj   +1 more source

The use of reference marks for precise tip positioning in scanning probe microscopy [PDF]

open access: yesКомпьютерная оптика, 2020
The article discusses techniques for the precise positioning of a probe tip on the surface under study in scanning probe microscopy. The precise tip positioning is of high importance when studying the same sample with various microscopes, probes, in ...
P.V. Gulyaev
doaj   +1 more source

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