Browsing by Keywords "Stability"
Now showing items 21-40 of 68
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Fixed order controller design via parametric methods
(Bilkent University, 2003)In this thesis, the problem of parameterizing stabilizing fixed-order controllers for linear time-invariant single-input single-output systems is studied. Using a generalization of the Hermite-Biehler theorem, a new ... -
Generating robust and stable schedules in a single machine environment
(IIE, 2004)Scheduling is a decision making process that concerns with allocation of limited resources (machines, material handling equipment, operators, tools, etc.) to competing tasks (operations of jobs) over time with the goal of ... -
Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells
(American Chemical Society, 2019)As an attractive materials system for high-performance optoelectronics, colloidal nanoplatelets (NPLs) benefit from atomic-level precision in thickness, minimizing emission inhomogeneous broadening. Much progress has been ... -
Hedging production schedules against uncertainty in manufacturing environment with a review of robustness and stability research
(Taylor & Francis, 2009)Scheduling is a decision-making process that is concerned with the allocation of limited resources to competing tasks (operations of jobs) over a time period with the goal of optimising one or more objectives. In theory, ... -
High-stability, high-efficiency organic monoliths made of oligomer nanoparticles wrapped in organic matrix
(American Chemical Society, 2016)Oligomer nanoparticles (OL NPs) have been considered unsuitable for solid-state lighting due to their low quantum yields and low temperature stability of their emission. Here, we address these problems by forming highly ... -
Highly stable, near-unity efficiency atomically flat semiconductor nanocrystals of CdSe/ZnS hetero-nanoplatelets enabled by ZnS-Shell hot-injection growth
(WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019)Colloidal semiconductor nanoplatelets (NPLs) offer important benefits in nanocrystal optoelectronics with their unique excitonic properties. For NPLs, colloidal atomic layer deposition (c‐ALD) provides the ability to produce ... -
Improved performance of organic light-emitting diodes with MoO3 interlayer by oblique angle deposition
(Optical Society of America, 2011)We fabricated and demonstrated improved organic light emitting diodes (OLEDs) in a thin film architecture of indium tin oxide (ITO)/molybdenum trioxide (MoO3) (20 nm)/ N,N'-Di(naphth-2-yl)-N,N'-diphenyl-benzidine (NPB) (50 ... -
Improved robustness, stability and linearity in GaN based high electron mobility transistors for 5G applications
(Bilkent University, 2021-06)5G technology requires high frequency and high power transistors. GaN-based high-electron-mobility transistors (HEMTs) are promising candidates to answer these needs. Although it is studied nearly for 30 years, there are ... -
Local convex directions for Hurwitz stable polynomials
(IEEE, 2002)A new condition for a polynomial p(s) to be a local convex direction for a Hurwitz stable polynomial q(s) is derived. The condition is in terms of polynomials associated with the even and odd parts of p(s) and q(s), and ... -
Local pinning of networks of multi-agent systems with transmission and pinning delays
(Institute of Electrical and Electronics Engineers, 2016)We study the stability of networks of multi-agent systems with local pinning strategies and two types of time delays, namely the transmission delay in the network and the pinning delay of the controllers. Sufficient ... -
Milling force modelling of multidirectional carbon fiber reinforced polymer laminates
(Elsevier, 2012)Carbon fiber reinforced polymer (CFRP) usage in the aerospace industry has been steadily increasing due to its superior material properties such as high strength, low weight, high resistance to corrosion, and a low thermal ... -
Modeling the latent period in compartmental epidemiological models
(Bilkent University, 2023-01)Two epidemiological models for the latent period are studied: the SEIR model and the SIR model with delay. Stability analysis of the endemic and the disease-free equilibria is performed for both models, and the basic ... -
Natural wax-stabilized perovskite nanocrystals as pen-on-paper inks and doughs
(American Chemical Society, 2022-05-27)Perovskite nanocrystals (PNCs) are emerging luminescent materials for a wide range of technological applications. The broad adaptation of PNCs will be greatly improved by addressing their intrinsically low stability and ... -
A new delayed feedback control scheme for discrete time chaotic systems
(IFAC, 2009)In this paper we consider the stabilization problem of unstable periodic orbits of discrete time chaotic systems. We consider both one dimensional and higher dimensional cases. We propose a novel generalization of the ... -
A new periodic controller for discrete time chaotic systems
(IFAC, 2010)In this paper we consider the stabilization problem of unstable periodic orbits of discrete time chaotic systems. For simplicity we consider only one dimensional case. We propose a novel periodic feedback controller law ... -
A nonlinear control scheme for discrete time chaotic systems
(The International Federation of Automatic Control, 2012-06)In this paper we consider the stabilization problem of unstable periodic orbits of discrete time chaotic systems. We consider both one dimensional and higher dimensional cases. We propose a nonlinear feedback law and present ... -
A numerical method for stability windows and unstable root-locus calculation for linear fractional time-delay systems
(Elsevier, 2012-08-14)This paper aims to provide a numerical algorithm able to locate all unstable poles, and therefore the characterization of the stability as a function of the delay, for a class of linear fractional-order neutral systems ... -
On the boundary control of beam equation
(IFAC, 2002)A flexible system described by Euler-Bernoulli beam equation is considered. The beam is clamped at one end, and is free at the other end. Boundary control force and torque inputs are applied at the free end of the beam. ... -
On the stability of Fröhlich bipolarons in spherical quantum dots
(Institute of Physics, 2002)In the strong-electron-phonon-coupling regime, we retrieve the stability criterion for bipolaron formation in a spherical quantum dot. The model that we use consists of a pair of electrons immersed in a reservoir of bulk ... -
On the stabilization of a flexible beam with a tip mass
(Society for Industrial and Applied Mathematics, 1998-11)We study the stability of a flexible beam that is clamped at one end and free at the other; a mass is also attached to the free end of the beam. To stabilize this system we apply a boundary control force at the free end ...
