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71.
72.
Miloslav Radakovi? Marek Obitko Vladimír Ma?ík 《Journal of Intelligent Manufacturing》2012,23(6):2601-2621
Currently, the manufacturing domain is primarily characterized by the flexibility, adaptability and robustness of the production system. The manufacturing flow processes lead to shorter cycle times to efficiently meet customer needs. Mentioned features can be more easily achieved in a distributed system, such as holonic or multi-agent system, which becomes strongly influenced by the advancement of semantic technologies. In the majority of existing multi-agent based control systems, which are responsible for acting, sensing, computing and production planning, the ontology (necessary for knowledge bases and communication) is usually hard-coded directly in the agent code. In this case, the hard-coded system behavior can be hardly maintained??usually system reprogramming is needed from time to time to satisfy customer requirements. In this paper we discuss the necessity of explicit definition of both declarative and procedural knowledge and propose explicit procedural knowledge handling. Sharing and distribution of such knowledge is discussed and illustrated on an implemented transportation system example. We also introduce the utilization of discussed architecture for explicit specification of agent behavior in failures patterns handling and smart grid configuration scenario. Such a solution greatly increases the possibility of system integration, openness, flexibility, and extensibility, all without having to restart the running distributed system. The topic discussed in this paper shows the ability of the dynamic reconfigurable multi-agent system to participate in development of industrial control systems and solutions. 相似文献
73.
Vladimír Balek 《Journal of Materials Science》1982,17(5):1269-1276
The initial stage of free sintering of thoria (ThO2) has been investigated by means of emanation thermal analysis. Thoria powder (having surface area of 18 m2 g–1) was prepared from thorium oxalate (homogeneously labelled by228Th) by heating to 500 ° C. The release of220Rn was studied at various temperatures. The curves of radon diffusion release measured during isothermal heating of thoria powder at four temperatures (705, 735, 780 and 825 ° C) have been used for investigating the kinetics of the surface changes of thoria powder during the initial stage of sintering. The experimental data evaluated obey the kinetic law E
p S
eff = const ×t
n
, whereE
p is the emanating power due to the diffusion of radon in intergranular space and open pores,S
eff is the effective surface area,t is time andn equals 0.64. The effective surface areaS
eff has been proposed as a new parameter characterizing the active surface of powdered solid and its changes during sintering. 相似文献
74.
Vladimíra Tomanová Krysztof Pielichowski Iva Sroková Alena Žoldaková Vlasta Sasinková Anna Ebringerová 《Polymer Bulletin》2008,60(1):15-25
Summary Carboxymethylcellulose (CMC, DSCM = 1) was partially hydrophobized in order to prepare polymeric surfactants by the transesterification reaction using the
methyl ester of the fatty acid complex of rapeseed oil (MERO). The chemical modification was performed in different reaction
media (i) DMF/TSA and (ii) H2O/DMF with and without K2CO3 as catalyst, at various reaction conditions and using microwave radiation with controlled power as heating source. The obtained
MERO-hydrophobized CMC (MH-CMC) comprising mixed fatty acyl esters were characterized by FT-IR and NMR spectroscopic techniques,
which indicated a very low degree of esterification (DS < 0.1). The derivatives showed, in spite of moderate surface tension-lowering
effects, excellent emulsifying activity for ‘oil in water’ type emulsions as well as good performance properties including
washing power and antiredeposition efficiency. The results suggested that surface-active MH-CMC derivatives can be prepared
under microwave heating at reaction times in the range of several minutes, what is a great advantage in comparison to transesterification
reactions lasting up to 6 h at conventional heating. The novel CMC esters represent biodegradable polymeric surfactants with
potential applications in manufacture of consumer products and in industrial processes. 相似文献
75.
Vladimír Koval Carlos Alemany Jaroslav Briančin Helena Bruncková 《Journal of Electroceramics》2003,10(1):19-29
The dielectric properties and phase transition behavior of the pseudo-ternary xPb(Mg1/3Nb2/3)O3-(1 – x)Pb(Zr,Ti)O3 solid solution system were investigated as a function of the Pb(Mg1/3Nb2/3)O3 (PMN) content and Ti/Zr ratio for selected compositions. The investigations have demonstrated a general trend in broadening of the phase transition and increasing diffusivity with increasing PMN content. For the morphotropic phase boundary (MPB) compositions, the dielectric permittivity maximum, its temperature (T
m) and the Curie-Weiss constant were found to decrease with increasing Mg1/3Nb2/3 concentration. When a Ti/Zr ratio was constant and equal to 53/47, temperature-dependent investigations demonstrated that the dielectric parameters involved in a modified Curie-Weiss law increase monotonically with increasing PMN content and T
m moves toward room temperature with average rate of –4.1°C/mol% as well. A phase transition in 0.5PMN-0.5Pb(Zr0.47Ti0.53)O3 and 0.25PMN-0.75Pb(Zr0.60Ti0.40)O3 ceramic systems exhibited a diffused behavior with a characteristic frequency dependence of T
m. From pyroelectric measurement, an unusual spontaneous polarization behavior at about 215 K is reported for some MPB compositions. 相似文献
76.
The paper presents a successful implementation of a flowsheeting package with many features of third generation simulators on a handy and cheap desk-top computer. This version is still powerful enough to solve industrial problems of reasonable size and it is especially suitable for operative calculation in places where it is difficult and/or expensive to reach a terminal network, i.e. branch offices or plants sites. 相似文献
77.
Vladimír Strejc 《Automatica》1981,17(1):7-21
The paper refers to methods used for identification of linear and nonlinear systems. Deterministic and stochastic approaches are distinguished and specific features concerning parameters, structure and state estimation are briefly discussed from the point of view of possible advantages and difficulties for identification. Attention is paid to different final goals of identification with respect to the convenience of the methods in question. The most important trends in identification approaches are argued by unsolved problems of identification, by the complexity of numerical calculations and of practical applications. The significance of the uncertainty in structure, parameters or noise and the possible application of the a priori knowledge of the analysed system are taken into consideration. 相似文献
78.
79.
One-parameter imbedding techniques are used to solve a standard nonlinear boundary value problem appearing in reaction engineering. The one-parameter imbedding technique is formulated in a general form, the resulting procedures are classified as the one-loop and multi-loop methods. Twelve multi-loop and two one-loop procedures are suggested to solve the problem in question. The behaviour of all methods proposed as well as the numerical results are discussed also for the case of multiple solutions. 相似文献
80.