Search results for " Stab"
showing 10 items of 1773 documents
Dynamic Output-Feedback Passivity Control for Fuzzy Systems under Variable Sampling
2013
Published version of an article in the journal: Mathematical Problems in Engineering. Also available from the publisher at: http://dx.doi.org/10.1155/2013/767093 Open Access This paper concerns the problem of dynamic output-feedback control for a class of nonlinear systems with nonuniform uncertain sampling via Takagi-Sugeno (T-S) fuzzy control approach. The sampling is not required to be periodic, and the state variables are not required to be measurable. A new type fuzzy dynamic output-feedback sampled-data controller is constructed, and a novel time-dependent Lyapunov-Krasovskii functional is chosen for fuzzy systems under variable sampling. By using Lyapunov stability theory, a sufficie…
Impulsive control on the synchronization for a class of chaotic Systems
2014
In this paper, the impulsive control problem on the synchronization for a class of chaotic systems is discussed. Based on Lyapunov stability theory, the new impulsive synchronization strategy is presented to realize the chaos synchronization and possesses the wider scope of application. Finally the numerical simulation examples are given to demonstrate the effectiveness of our theoretical results.
H<inf>&#x221E;</inf> controller design for the synchronization of a hyper-chaotic system
2013
In this paper, the robust control on the synchronization of a hyper-chaotic system is investigated. Based on Lyapunov stability theory and linear matrix inequality techniques, the multi-dimensional and the single-dimensional robust H∞ synchronization controllers are constructed for the possible application in practical engineering. Some numerical simulations are provided to demonstrate the effectiveness of the presented controllers.
Biodegradable Protein Nanocontainers
2015
The application of synthetic polymers for drug delivery often requires tremendous efforts to ensure biocompatibility and -degradation. To use the body's own substances can help to overcome these problems. Herein, we present the first synthesis of nanocontainers entirely composed of albumin proteins. These protein nanocontainers (PNCs) were loaded with hydrophilic compounds and release of the payload is triggered through natural lysis in vitro in human monocyte-derived dendritic cells (moDCs). No aggregation of PNCs in human blood plasma was observed, indicating stability for blood circulation. As the PNCs were readily taken up by moDCs, they are considered as a promising delivery platform f…
Analysis of soliton dynamics and noise induced effects on the superconductive lifetime in long Josephson junctions.
2013
The influence of various noise sources on the transient dynamics of long Josephson junctions (LJJ) is investigated in the presence of an oscillating bias current signal and a noise source with Gaussian or non-Gaussian (i.e. Cauchy-Lorentz or Lévy-Smirnov) probability distributions. These systems are computationally analyzed integrating the perturbed Sine-Gordon equation describing the phase evolution. We found evidence of noise induced effects on trends of the mean escape time (MET) from the superconductive metastable state, varying different system parameters, as the bias frequency, noise intensity and junction length. In particular, we find resonant activation (RA) and noise enhanced stab…
Transient dynamics in driven long Josephson junctions.
2013
The switching time from the superconductive metastable state of a long Josephson junction (LJJ)[1] is computationally analyzed in the framework of the perturbed sine-Gordon equation. The model includes an external bias current term and a stochastic noise source, i.e. a Lévy noise term. The effects of this noise on the mean escape time (MET) from the superconductive state are analyzed. The investigation is performed by considering a wide range of values of system parameters and different noise statistics: Gaussian, Cauchy-Lorentz and Lévy-Smirnov[2]. We found evidence of well known noise induced phenomena on the MET behavior, that is the noise enhanced stability (NES) and resonant activation…
Epigenetics and periodontics : a systematic review
2019
Background Despite decades of research, our knowledge of several important aspects of periodontal pathogenesis remains incomplete. Epigenetics allows to perform dynamic analysis of different variations in gene expression, providing this great advantage to the static measurement provided by genetic markers. The aim of this systematic review is to analyze the possible relationships between different epigenetic mechanisms and periodontal diseases, and to assess their potential use as biomarkers of periodontitis. Material and Methods A systematic search was conducted in six databases using MeSH and non-MeSH terms. The review fulfilled PRISMA criteria (Preferred Reporting Items for Systematic re…
Dažādu ziedu izcelsmes medus autentiskuma novērtējums
2020
Dažādu ziedu izcelsmes medus autentiskuma novērtējums. Labsvārds K. D., zinātniskais vadītājs profesors, Dr. chem., Vīksna A.. Maģistra darbs, 97 lappuses, 23 attēli, 17 tabulas, 139 literatūras avoti, 8 pielikumi. Latviešu valodā. Medus ir dabīgas izcelsmes saldinātājs, kura autentiskuma noteikšanas metodes nodrošina svarīgu lomu, lai pasargātu patērētājus no maldināšanas vai iespējamiem veselības draudiem. Medus aprite ekonomikā arī ir svarīgs aspekts, tāpēc modernas un efektīvas autentiskuma noteikšanas metodes ir nepieciešamas. Pēdējā desmitgadē aizvien plašāk tiek izmantotas dažādas datu apstrādes metodes ķīmijā, kur tiek izmantots vairāku instrumentālu metožu apkopojums. Darbā apkopot…
Meliorācijas ietekme uz Vesetnieku ekoloģiskā stacionāra kūdras augsnes ķīmisko sastāvu
2015
Darbā pētīti nosusinātā un nenosusinātā pārejas tipa purva augsnes paraugi, sadarbībā ar Latvijas Valsts mežzinātnes institūta „Silava” pētniekiem. Darba ietvaros ķīmiskajām analīzēm kūdras paraugi ņemti no 6 parauglaukumiem, no noteiktiem augsnes dziļumiem (O horizonts, 0-10 cm, 10-20 cm, 20-40 cm, 40-80 cm, kopā 26 paraugi). Augsnes paraugiem noteikta oglekļa un slāpekļa stabilo izotopu attiecība, 1 M HNO3 ekstrahējamo Fe, Zn, Cu, Mn, K, Pb, Cr, Cd un Ni saturs, augsnes pH un homogenitāte. Noteikta elementu analizatora izotopu attiecības masspektrometra mērījumu linearitāte un stabilitāte ar laboratorijas references materiāla.