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排序方式: 共有66条查询结果,搜索用时 15 毫秒
1.
K. G. Arvanitis P. N. Paraskevopoulos 《Journal of Optimization Theory and Applications》1995,87(2):235-267
This paper deals with the problem of designing multirate-output contrlleers for sampled-dataH
-optimal control of linear continuous-time systems. Two formulations of the problem are studied. In the first, the intersample behavior of the disturbance and the controlled output signals is not considered, whereas in the second the continuous-time nature of these signals is taken into account. It is shown that, in both cases and unter appropriate conditions, it is plausible to reduce the repective initial problem to an associated discrete-timeH
-optimization problem for which a fictitious static state feedback controller is to be designed. This fact has a beneficial influence on the theoretical and numerical complexity of the problem, since only one algebraic Riccati equation is to be solved here, as compared to two algebraic Riccati equations needed in known techniques concerning theH
-optimization problem with dynamic measurement feedback.The work described in this paper has been partially funded by the General Secretariat for Research and Technology of the Greek Ministry of Industry, Research, and Technology and by the Heracles General Cement Company of Greece. 相似文献
2.
M. Anastasiou Th. Hasapis T. Zorba E. Pavlidou K. Chrissafis K. M. Paraskevopoulos 《Journal of Thermal Analysis and Calorimetry》2006,84(1):27-32
Historic
plasters from wall paintings of Byzantine and post-Byzantine churches situated
in the Balkan region were studied. All wall paintings were made with fresco
technique and are dated from IX - XVI century. Plaster samples were followed
from room temperature to 1000°C by Thermogravimetric (TG) and Differential
Thermal Analysis (DTA), and one or two significant temperature regions, corresponding
to thermal decomposition mechanisms were observed. The analysis of the plaster
samples and the composition characterization was carried out using also, Fourier
Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM).
Although the main components are calcite and quartz (from sand) in different
proportions, there are differences between them such as the presence of gypsum
being either as a constituent element or due to environmental pollution. The
results are examined comparatively taking into account the creation time and
place of the paintings. 相似文献
3.
4.
K. Chrissafis K. M. Paraskevopoulos C. Manolikas 《Journal of Thermal Analysis and Calorimetry》2006,84(1):195-199
The
thermal effect accompanying the transition of Cu2–xSe
into a superionic conduction state was studied by non-isothermal measurements,
at different heating and cooling rates (β=1, 2.5, 5, 10 and 20°C
min–1). During heating the peak temperature
(Tp) remains almost
stable for all values of β, (136.8±0.4°C for Cu2Se
and 133.0±0.3°C for Cu1.99Se). A gradual
shift of the initiation of the transformation towards lower temperatures is
observed, as the heating rate increases. During cooling there is a significant
shift in the position of the peak maximum (Tp)
towards lower temperatures with the increase of the cooling rate. A small
hysteresis is observed, which increases with the increase of the cooling rate, β.
The mean value of transformation enthalpy was found to be 30.3±0.8
J g–1 for Cu2Se and
28.9±0.9 J g–1 for Cu1.99Se.
The transformation can be described kinetically by the model f(ǯ)=(1–ǯ)n(1+kcatX), with activation energy E=175 kJ mol–1,
exponent value n equal to 0.2, logA=20 and log(kcat)=
0.5. 相似文献
5.
K. G. Arvanitis P. N. Paraskevopoulos 《Journal of Optimization Theory and Applications》1995,84(3):471-493
The use of multirate sampled-data controllers for linear multivariable time-invariant systems with unknown parameters is investigated. Such controllers contain periodically time-varying elements and a multirate sampling mechanism with different sampling periods at each system input. Their application to unknown continuous-time linear multi-input, multi-output systems results in a sampled closedloop system for which an arbitrary discrete-time transfer function matrix can be assigned, as is shown in the present paper. The contribution of the present paper is twofold: the use of multirate sampled-data controllers in the area of model reference adaptive control; and the application, for the first time, of periodically varying controllers for model reference adaptive control of multi-input, multi-output systems.The work described in this paper has been partialy funded by the General Secretariat for Research and Technology of the Greek Ministry of Industry, Research, and Technology and by the Heracles General Cement Company of Greece. 相似文献
6.
A reactive variable neighborhood tabu search for the heterogeneous fleet vehicle routing problem with time windows 总被引:1,自引:0,他引:1
D. C. Paraskevopoulos P. P. Repoussis C. D. Tarantilis G. Ioannou G. P. Prastacos 《Journal of Heuristics》2008,14(5):425-455
This paper presents a solution methodology for the heterogeneous fleet vehicle routing problem with time windows. The objective
is to minimize the total distribution costs, or similarly to determine the optimal fleet size and mix that minimizes both
the total distance travelled by vehicles and the fixed vehicle costs, such that all problem’s constraints are satisfied. The
problem is solved using a two-phase solution framework based upon a hybridized Tabu Search, within a new Reactive Variable
Neighborhood Search metaheuristic algorithm. Computational experiments on benchmark data sets yield high quality solutions,
illustrating the effectiveness of the approach and its applicability to realistic routing problems.
This work is supported by the General Secretariat for Research and Technology of the Hellenic Ministry of Development under
contract GSRT NM-67. 相似文献
7.
New Calix[4]arene‐Cored Peripherally Functionalized Dendrimers: Synthesis and Conformational Characteristics 下载免费PDF全文
Georgios Paraskevopoulos Dimitrios Alivertis Vassiliki Theodorou Konstantinos Skobridis 《Helvetica chimica acta》2015,98(5):593-603
New calixarene‐based dendrimers, containing calix[4]arene as the core and different generations of Fréchet‐type poly(benzyl ether) dendrons as building blocks, which possess either Br‐atoms or COOtBu groups at their surface were synthesized and presented herein for the first time. The new calix[4]arene‐cored dendritic macromolecules were fully characterized and found to prefer strictly the cone conformation. 相似文献
8.
9.
Rate constants for the recombination reaction OD + NO2 + M → DNO3 + M have been determined in the falloff region (5–500 torr) and at 297 ± 2 K, in the presence of He, N2, and SF6 as third bodies, by using a pulsed laser photolysis-resonance absorption technique. Values of k0, kx and the falloff parameter Fc have been estimated. Our rate constants were, within the experimental uncertainty, the same as those reported for the reaction of OH radicals with NO2. 相似文献
10.
Zorba T Andrikopoulos KS Paraskevopoulos KM Pavlidou E Popkonstantinov K Kostova R Platnyov V Daniilia S 《Annali di chimica》2007,97(7):491-503
Vibrational spectroscopy is applied on samples obtained from the excavation area of the medieval Monastery (10th century) of Karaach-Teke in Bulgaria. The results of the corresponding study, reveal the type of materials used for the creation of the wall-paintings and give evidence of Byzantine influence, a fact that further supports the well known impact of Byzantium on the technology and thematic-aesthetic features of iconography in Bulgaria during this era. In addition, the complementarity of FTIR and micro-Raman spectroscopies in the identification of pigments is indicated. 相似文献