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5953. Decade of seismological observations in the northern part of Moravo-Silesian region

Creator:
Zdeněk Kaláb, Jaromír Knejzlík, and Holub, Karel
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, seizmicita, zemětřesení, seismicity, earthquake, Morava (Česko), Slezsko (Česko), Silesia (Czechia), Moravia (Czechia), seismic network, microearthquake, Moravo-Silesian region, 7, and 551
Language:
English
Description:
The essential point for seismological observation in the northern part of Moravia, Czech Republic, is a permanent seismic station Ostrava - Krásné Pole (OKC) that is a part of the Czech regional seismological network (hereafter CRSN). Institute o f Geonics AS CR, v.v.i., has also operated temporary seismic stations in this region since 1997. Current seismological stations are located in an abandoned mine working located in Zlaté Hory and in cellars in Klokočov and castle Raduň near Opava. The natural seismicity is after the swarm of microearthquakes in the vicinity of Opava in 1993 very low now. In region under discussion, seismic manifestations generated by mining induced seismicity in Upper Silesian Coal Basin (both Karviná an d Polish parts) and in Legnica-Głogów Copper District (LGOM) are also detected. Significant part of observations in this region is made by the Institute of Physics of the Earth (hereafter IPE), Masaryk University Brno, and about 1000 microearthquakes have been detected during the last ten years with maximum local magnitude up to 1.9., Zdeněk Kaláb, Jaromír Knejzlík and Karel Holub., and Obsahuje bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5954. Decay kinetics of tyrosine radical (YZ*) in chloride anion-depleted photosystem 2 studied by time-resolved EPR

Creator:
Jajoo, A., Bharti, S., and Kawamori, A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
bicarbonate, bromide, EPR, fluoride, iodide, nitrate, phosphate, photosystem 2, spinach, tyrosine radical, and sulphate
Language:
Multiple languages
Description:
The decay of tyrosine cation radical was found to be biphasic at 253 K. The fast phase corresponds to the YZ* component while the slow phase corresponds to the tyrosine D radical (YD*) component. At 253 K, the t1/2 value was ∼28.6 s for the fast phase and ∼190.7 s for the slow phase. The fast phase is attributed to the recombination of charges between YZ* and QA-. The activation energy for the reaction of YZ with QA- between 253 and 293 K was 48 kJ mol-1 in Cl--depleted photosystem 2 (PS2) membranes. Both the decay rate and the amplitude of the PAR-induced signal of YZ* were affected by addition of chloride anion. Change in the decay rate and the amplitude of the PAR-induced signal of YZ* was observed when other anions like Br-, I-, F, HCO3-, NO3-, PO43- were substituted in the Cl--depleted PS2. and A. Jajoo, S. Bharti, A. Kawamori.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5955. Decentralized control and synchronization of time-varying complex dynamical network

Creator:
Zhong, Wei-Song, Stefanovski, Jovan D., Dimirovski, Georgi M., and Zhao, Jun
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
decentralized control, complex dynamical network, similarity, stabilization, and synchronization
Language:
English
Description:
A new class of controlled time-varying complex dynamical networks with similarity is investigated and a decentralized holographic-structure controller is designed to stabilize the network asymptotically at its equilibrium states. The control design is based on the similarity assumption for isolated node dynamics and the topological structure of the overall network. Network synchronization problems, both locally and globally, are considered on the ground of decentralized control approach. Each sub-controller makes use of the information on the corresponding node's dynamics and the resulting overall controller is composed of those sub-controllers. The overall controller can be obtained by means of a combination of typical control designs and appropriate parametric tuning for each isolated node. Several numerical simulation examples are given to illustrate the feasibility and the efficiency of the proposed control design.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

5956. Decentralized control for large-scale systems with itme-varying delay and unmatched uncertainties

Creator:
Liu, Wen-Jeng
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
decentralized variable structure control, uncertain large-scale systems, time-delayed systems, and unmatched uncertainty
Language:
English
Description:
Many real-world systems contain uncertainties and with time-varying delays, also, they have become larger and more complicated. Hence, a new decentralized variable structure control law is proposed for a class of uncertain large-scale system with time varying delay in the interconnection and time varying unmatched uncertainties in the state matrix. The proposed decentralized control law for the large-scale time-varying delay system is realized independently through the delayed terms and it can drive the trajectories of the investigated systems onto the sliding mode. Further, the proposed control law can be successfully applied to stabilize a class of uncertain large-scale time-varying delay system with matched and unmatched uncertainties. The so-called sliding coefficient matching condition can be extended for the decentralized variable structure control of the uncertain large-scale time-varying delay systems. Furthermore, in the sliding mode, the investigated system with matched and unmatched uncertainties still bears the insensitivity to the uncertainties and disturbances, which is the same as the systems with just matched uncertainties do. Finally, an illustrative example is given to verify the validity of the proposed decentralized variable structure control law. It has been shown that the proposed decentralized control law is effective for all subsystems of the investigated system. However, the traditional decentralized variable structure control law is not applicable to the investigated system with unmatched uncertainties. It is worth noting that the traditional large-scale system is only a special case in this work.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

5957. Decentralized output regulation of large scale nonlinear systems with delay

Creator:
Ding, Zhengtao
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
decentralized control, output regulaton, nonlinear systems, and time delay
Language:
English
Description:
This paper deals with output regulation of a class of large-scale nonlinear systems with delays. Each of the subsystems is in the output feedback form, with nonlinear functions of the subsystem output and the outputs of other subsystems. The system outputs are subject to unknown constant delays. Both the system dynamics and the measurements are subject to unknown disturbances generated from unknown linear exosystems. Decentralized control design approach is adopted to design local controllers using measurements or regulated errors in each subsystems. It is shown in this paper that delays in the outputs of subsystems do not affect the existence of desired feedforward control input, and the invariant manifolds and the desired feedforward inputs always exist if the nonlinear functions are polynomials. Through a special parameterization of an augmented exosystem, an internal model can be designed for each subsystem, without the involvements of the uncertain parameters. The uncertain parameters affected by the uncertainty of the exosystem are estimated using adaptive control laws, and adaptive coefficients in the control inputs are used to suppress other uncertainties. The proposed decentralized adaptive control strategy ensures the global stability of the entire system, and the convergence to zero of the regulated errors. An example is included to demonstrate the proposed control strategy.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

5958. Decentralized robust tracking control of uncertain large scale systems with multiple delays in the interconnections

Creator:
Wu, Hansheng
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
large scale systems, time delay, decentralized control, and robust tracking
Language:
English
Description:
The problem of the decentralized robust tracking and model following is considered for a class of uncertain large scale systems including time-varying delays in the interconnections. On the basis of the Razumikhin-type theorem and the Lyapunov stability theory, a class of decentralized memoryless local state feedback controllers is proposed for robust tracking of dynamical signals. It is shown that by employing the proposed decentralized robust tracking controllers, one can guarantee that the tracking error between each time-delay subsystem and the corresponding local reference model without time-delay decreases uniformly asymptotically to zero. In this paper, it is assumed that the time-varying delays are any continuous and bounded nonnegative functions, and the proposed decentralized robust tracking controllers are independent of the delays. Therefore, the results obtained in the paper are applicable to large scale systems without exact knowledge of the delays, i. e. large systems with perturbed delays.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

5959. Decentralized structural controller design for large-scale discrete-event systems modelled by Petri nets

Creator:
Aybar, Ayden and Íftar, Altuč
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
large-scale systems, decentralized control, discrete-event systems, Petri nets, and overlapping decompositions
Language:
English
Description:
A decentralized structural controller design approach for discrete-event systems modelled by Petri nets is presented. The approach makes use of overlapping decompositions. The given Petri net model is first overlappingly decomposed into a number of Petri subnets and is expanded to obtain disjoint Petri subnets. A structural controller is then designed for each Petri subnet to avoid deadlock. The obtained controllers are finally applied to the original Petri net. The proposed approach significantly reduces the computational burden to design the controller. Furthermore, the controller obtained is decentralized and, hence, is easier to implement.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

5960. Decision making under uncertainty and mixed models

Creator:
Sľobodová, Anna
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
decision making under uncertainty, mixed models, and expected utility networks
Language:
English
Description:
We use relations between undirected graphs and conditional independence to introduce a new class of graphical representations, expected utility networks with hoth discrete and continuous variables and discuss some of their structural properties. We want to show that in these networks node separation with respect to the probability and utility subgraphs implies conditional utility independence, and conditional independent decisions can be effectively decentralized. An application to decision making in expected utility networks in mixed models is introduced.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

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