Search results for "AOS"
showing 10 items of 330 documents
Intraosālās pieejas izmantošana intensīvajā un neatliekamajā aprūpē
2015
Bakalaura darba tēma – intraosālas pieejas izmantošana intensīvajā un neatliekamajā aprūpē. Tēmas aktualitāti nosaka lielais dažādu traumu un nelaimes gadījumu skaits, kad cilvēka dzīvība ir apdraudēta un pieeja asinsrites sistēmai, nereti, ir viens no nozīmīgākajiem posmiem ārstniecībā. Pētījuma mērķis – izpētīt intraosālās pieejas izmantošanu intensīvajā un neatliekamajā aprūpē. Pētījuma jautājums – cik aktuāla ir intraosālās pieejas izmantošana intensīvajā un neatliekamajā aprūpē? Pētījuma gaitā tiks izpētīti literatūras avoti par intraosālo pieeju, kā arī analizēti māsu viedokļi un pieredze saistībā ar šo pieeju. Pētījuma metode un materiāls - pētījums veikts X un Y ārstniecības iestādē…
Assessing Non-Linear Structures in Real Exchange Rates Using Recurrence Plot Strategies
2002
MODELLING AND SIMULATING RISKS IN THE TRAINING OF THE HUMAN RESOURCES BY APPLYING THE CHAOS THEORY
2012
The article approaches the modelling and simulation of risks in the training of the human resources, as well as the forecast of the degree of human resources training impacted by risks by applying the mathematical tools offered by the Chaos Theory and mathematical statistics. We will highlight that the level of knowledge, skills and abilities of the human resources from an organization are autocorrelated in time and they depend on the level of a previous moment of the training, as well as on the impact of the risk factors that can materialize in the process of the continuous training of human resources. The process of self-correlation and continuous training ensures the sustainable and qual…
Anaerobic on-site wastewater treatment at low temperatures
2005
Sari Luostarinen tutki väitöstyössään hajautettua anaerobista jätevesien käsittelyä alhaisissa lämpötiloissa (10-20 °C). Anaerobinen käsittely mahdollistaa sekä jätemateriaalin stabiloinnin, uusiutuvan energian tuotannon metaanina ja/tai vetynä että arvokkaiden yhdisteiden, kuten ravinteiden, uudelleenkäytön. Luostarisen mukaan käsittely voidaan toteuttaa hajautettuna kiinteistö- tai kyläkohtaisissa prosesseissa. Mikäli ravinteiden uudelleenkäyttö ei ole mahdollista, esimerkiksi hygieniamääräyksien vuoksi, ja ravinteiden poistoa vaaditaan, se voidaan toteuttaa aerobisessa jälkikäsittelyprosessissa. Luostarisen tutkimuksessa kaksivaiheinen anaerobinen ylösvirtaussaostuskaivo (UASB-saostuskai…
Hidden attractors in Chua circuit: mathematical theory meets physical experiments
2022
AbstractAfter the discovery in early 1960s by E. Lorenz and Y. Ueda of the first example of a chaotic attractor in numerical simulation of a real physical process, a new scientific direction of analysis of chaotic behavior in dynamical systems arose. Despite the key role of this first discovery, later on a number of works have appeared supposing that chaotic attractors of the considered dynamical models are rather artificial, computer-induced objects, i.e., they are generated not due to the physical nature of the process, but only by errors arising from the application of approximate numerical methods and finite-precision computations. Further justification for the possibility of a real exi…
Chaos and its Degradation-Promoting-Based Control in an Antithetic Integral Feedback Circuit
2022
This letter deals with a novel variant of antithetic integral feedback controller (AIFC) motifs which can feature robust perfect adaptation, a pervasive (desired) ability in natural (synthetic) biomolecular circuits, when coupled with a wide class of process networks to be regulated. Using the separation of timescales in the proposed kind of AIFC, here we find a reducedorder controller that captures the governing slow part of the original solutions under suitable assumptions. Inspired by R(ossler systems, we then make use of such a simpler controller to show that the antithetic circuit can exhibit chaotic behaviors with strange attractors, where the bifurcation from a homeostatic state to c…
Time-delay control for stabilization of the Shapovalov mid-size firm model
2020
Control and stabilization of irregular and unstable behavior of dynamic systems (including chaotic processes) are interdisciplinary problems of interest to a variety of scientific fields and applications. Using the control methods allows improvements in forecasting the dynamics of unstable economic processes and offers opportunities for governments, central banks, and other policy makers to modify the behaviour of the economic system to achieve its best performance. One effective method for control of chaos and computation of unstable periodic orbits (UPOs) is the unstable delay feedback control (UDFC) approach, suggested by K. Pyragas. This paper proposes the application of the Pyragas' me…
D3 Dihedral Logistic Map of Fractional Order
2021
In this paper, the D3 dihedral logistic map of fractional order is introduced. The map presents a dihedral symmetry D3. It is numerically shown that the construction and interpretation of the bifurcation diagram versus the fractional order requires special attention. The system stability is determined and the problem of hidden attractors is analyzed. Furthermore, analytical and numerical results show that the chaotic attractor of integer order, with D3 symmetries, looses its symmetry in the fractional-order variant.
The Lorenz system : hidden boundary of practical stability and the Lyapunov dimension
2020
On the example of the famous Lorenz system, the difficulties and opportunities of reliable numerical analysis of chaotic dynamical systems are discussed in this article. For the Lorenz system, the boundaries of global stability are estimated and the difficulties of numerically studying the birth of self-excited and hidden attractors, caused by the loss of global stability, are discussed. The problem of reliable numerical computation of the finite-time Lyapunov dimension along the trajectories over large time intervals is discussed. Estimating the Lyapunov dimension of attractors via the Pyragas time-delayed feedback control technique and the Leonov method is demonstrated. Taking into accoun…
Spectral analysis and quantum chaos in two-dimensional nanostructures
2015
This thesis describes a study into the eigenvalues and eigenstates of twodimensional (2D) quantum systems. The research is summarized in four scientific publications by the author. The underlying motivation for this work is the grand question of quantum chaos: how does chaos, as known in classical mechanics, manifest in quantum mechanics? The search and analysis of these quantum fingerprints of chaos requires efficient numerical tools and methods, the development of which is given a special emphasis in this thesis. The first publication in this thesis concerns the eigenspectrum analysis of a nanoscale device. It is shown that a measured addition energy spectrum can be explained by a simple …