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7572. Efficiency of capillary barriers in relation to retention curves data
- Creator:
- Trpkošová, Dagmar and Jiří Mls
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, hystereze, hysteresis, capillary barrier, retention curve, hydraulic characteristics, tension apparatus, 7, and 551
- Language:
- English
- Description:
- A good knowledge of hydraulic characteristics, particularly the retention curves, of the applied materials is necessary when studying the efficiency of a capillary barrier or numerically simulating flow of water in its layers. The main difficulties of their measurements originate in the fact that the coarse-grained soils of capillary barriers come from the state of residual moisture to the state of saturation within relatively small interval of pressure head. Hence, it is necessary to carry out the measurements in very fine steps of pressure head. Four materials of two capillary barriers are investigated in this paper. The tension apparatus according to Havlíček and Myslivec was used to measure their retention curves. Both branches of retention curves were measured in order to obtain data suitable for taking hysteresis into account. The method is described and the results are presented. Subsequently, the hydraulic characteristics of the materials are determined and their impact to the capillary barriers efficiency is investigated. The barriers were compared from the viewpoint of their efficiency using the measured data and tipping trough measurements made elsewhere. Explanation of the found differences was suggested and the effect of hysteresis was discussed., Dagmar Trpkošová and Jiří Mls., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7573. Efficiency of flexible budgetary institutions
- Creator:
- Bowen, T. Renee, Chen, Ying, Eraslan, Hülya, and Zápal, Jan
- Publisher:
- CERGE-EI
- Format:
- electronic, bez média, svazek, and 53 stran : ilustrace.
- Type:
- model:monograph and TEXT
- Subject:
- Veřejné finance, veřejné výdaje, ekonomická efektivnost, modelování a simulace, public expenditures, economic efficiency, modeling and simulation, 336.5, 330.13, 519.86/.87, (048.8), 4, and 336.1/.5
- Language:
- English and Czech
- Description:
- T. Renee Bowen, Ying Chen, Hülya Eraslan, Jan Zápal., Obsahuje bibliografii a bibliografické odkazy, and České a anglické resumé
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7574. Efficiency of individual CRL stations in seismic monitoring of the Western Gulf of Corinth
- Creator:
- Jaromír Janský, Jiří Zahradník, and Vladimír Plicka
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, seizmicita, seismicity, Gulf of Corinth, Corinth Rift Laboratory seismic network, 7, and 551
- Language:
- English
- Description:
- We study the efficiency of individual stations of the CRL seismic network in recording the seismic activity in the western Gulf of Corinth, Greece. The stations are located on both the northern and southern coast of the Gulf. The study is based on 5027 earthquakes recorded in 2001, separated into three groups, the southern, central and the northern one. The events were located using the HYPO71PC algorithm. It is shown that the stations significantly differ in their monitoring ability., Jaromír Janský, Jiří Zahradník and Vladimír Plicka., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7575. Efficiency of NO donors in substituting impaired endogenous NO production: a functional and morphological strudy
- Creator:
- Mária Gerová and Kristek, F.
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, oxid dusnatý, hypertenze, morfologie (biologie), nitric oxide, hypertension, morphology (biology), conduit arteries, molsidomine, isosorbide-5-mononitrate, NOS activation, 14, and 612
- Language:
- English
- Description:
- Two exogenous NO donors were used to act as substitutes for impaired endogenous nitric oxide (NO) production due to inhibition of NO synthase in rats. Six weeks' lasting inhibition of NO synthase by NG-nitro-L-arginine methyl ester (L-NAME) induced stabilized hypertension. Simultaneously administered isosorbide-5-mononitrate did not prevent the development of hypertension. Molsidomine, administered concomitantly with L-NAME, significantly attenuated the BP increase. However, BP was still found to be moderately increased compared to the initial values. Remarkable alterations in the geometry of the aorta, carotid and coronary artery found in NO-deficient hypertension were prevented in rats administered L-NAME plus molsidomine at the same time. In spite of 6 weeks' lasting inhibition of NOS, the NOS activators acetylcholine and bradykinin induced BP decrease; the maximum hypotensive value did not differ from the values recorded in the controls or in animals treated with L-NAME plus molsidomine. Notably enough, the hypotension was similar to that found in rats administered L-NAME alone for six weeks. After NO synthase inhibition, Isosorbide-5-mononitrate does not substitute and molsidomine substitute only partially the impaired endogenous NO production., M. Gerová, F. Kristek., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7576. Efficiency of various methods of the search for periodic orbits
- Creator:
- Hadrava, P. and Kadrnoška, J.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- solar system, periodic orbits, and dynamics of asteroids
- Language:
- Czech
- Description:
- The periodic orbits in circular restricted 3-body problem are calculated by different numerical as well as analytical methods. The efficiency of both kinds are compared in this contribution. The improvement of analytical methods can be achieved by an artificial splitting of perturbation term. The analytical approximations are thus sufficiently accurate even for large values of mass ratio μ. The use of these approximations as a zero-order approximation In numerical codes for search for periodic orbits improves their efficiency also.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7577. Efficient algorithm to solve optimal boundary control problem for burgers´ equation
- Creator:
- Malek, Alaedoin, Nataj, Rochayer Ebrahim, and Yazdanpanah, Mohamad Javad
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- optimal boundary control, Burgers´ equation, conjugate gradient method, modal expansion technique, and control parametrization
- Language:
- English
- Description:
- In this paper, we propose a novel algorithm for solving an optimal boundary control problem of the Burgers' equation. The solving method is based on the transformation of the original problem into a homogeneous boundary conditions problem. This transforms the original problem into an optimal distributed control problem. The modal expansion technique is applied to the distributed control problem of the Burgers' equation to generate a low-dimensional dynamical system. The control parametrization method is formulated for approximating the time-varying control by a finite term of the orthogonal functions with unknown coefficients determined through an optimization process. The minimization of the objective functional is performed by using a conjugate gradient method. The accuracy and convergent rate of this hybrid method are shown by some numerical examples.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7578. Efficient application of e-invariants in finite element method for an elastodynamic equation
- Creator:
- Balazovjech, Martin and Halada, Ladislav
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- e-invariants, finite element method, elastodynamics equation, and efficient computation
- Language:
- English
- Description:
- We introduce a new efficient way of computation of partial differential equations using a hybrid method composed from FEM in space and FDM in time domain. The overall computational scheme is explicit in time. The key idea of the suggested way is based on a transformation of standard basis functions into new basis functions. The results of this matrix transformation are e-invariants (effective invariants) with such suitable properties which save the number of arithmetical operations needed for a problem solution. The application of this procedure and its effectiveness for 2D problem was the first time published in \cite{halabala}. Now we describe the generalization of this procedure for 3D problem. In order to present the main principle of our process and its advantage, we first explain the main idea of our approach on a simple 1D example and then the application of the e-invariants on an elastodynamics equation using hexahedral elements in 3D is described. Finally, the efficiency of the suggested method in both cases from the point of the required number of arithmetical operations is analyzed. The result of this analysis confirms computational efficiency the suggested method and the usefulness of e-invariants which save only the essential information needed for the computation. Moreover, the method can be used for various types of elements and equations.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7579. Efficient collective redress mechanisms in Visegrad 4 Countries: an achievable target?
- Creator:
- Simon, Rita and Müllerová, Hana
- Publisher:
- Ústav státu a práva AV ČR, v.v.i
- Format:
- electronic, electronic resource, remote, bez média, online zdroj, and 1 online zdroj (280 stran).
- Type:
- model:monograph and TEXT
- Subject:
- Soukromé právo, náhrada škody, reparations, země Visegrádské skupiny, Visegrád Group countries, kolektivní odškodnění, collective redress, 347.426.6, 347.513, (4-191.2), (082), (0.034.2:08), 16, and 347
- Language:
- English
- Description:
- Rita Simon, Hana Müllerová (eds.)., Obsahuje bibliografii a bibliografické odkazy, and born digital
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7580. Efficient measurement of higher-order statistics of stochastic processes
- Creator:
- Magiera, Wladyslaw, Libal, Urszula, and Wielgus, Agnieszka
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- covariance matrix, higher-order statistics, adaptive, and nonlinear
- Language:
- English
- Description:
- This paper is devoted to analysis of block multi-indexed higher-order covariance matrices, which can be used for the least-squares estimation problem. The formulation of linear and nonlinear least squares estimation problems is proposed, showing that their statements and solutions lead to generalized `normal equations', employing covariance matrices of the underlying processes. Then, we provide a class of efficient algorithms to estimate higher-order statistics (generalized multi-indexed covariance matrices), which are necessary taking in mind practical aspects of the nonlinear treatment of the least-squares estimation problem. The algorithms are examined for different higher-order and non-Gaussian processes (time-series) and an impact of signal properties on covariance matrices is analysed.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public