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44962. Water turbine power control - feasible conception
- Creator:
- Němec, Zdeněk and Němec, Vojtěch
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- water power plant, water turbine, power control, and water turbine control
- Language:
- English
- Description:
- This paper is concerned with Francis water turbine power control issue. There are introduced six conceptions of power controllers and corresponding control loop features are discussed. The control features are illustrated with step responses and the major attention is paid to the undesirable under-control effect. On an example of control system with an elementary description and with relatively short turbine pipeline feeder are the control features compared. and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
44963. Water-wave problem for a vertical shell
- Creator:
- Kuznetsov, Nikolay and Maz'ya, Vladimir
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- time-harmonic velocity potential, uniqueness theorem, Helmholtz equation, Neumann’s eigenvalue problem for Laplacian, integral equation method, and weighted Hölder spaces
- Language:
- English
- Description:
- The uniqueness theorem is proved for the linearized problem describing radiation and scattering of time-harmonic water waves by a vertical shell having an arbitrary horizontal cross-section. The uniqueness holds for all frequencies, and various locations of the shell are possible: surface-piercing, totally immersed and bottom-standing. A version of integral equation technique is outlined for finding a solution.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
44964. Watson-Crick pushdown automata
- Creator:
- Chatterjee , Kingshuk and Ray, Kumar S.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- deterministic Watson-Crick automata, deterministic Watson-Crick pushdown automata, deterministic multi-head pushdown automata, and context free languages
- Language:
- English
- Description:
- A multi-head 1-way pushdown automaton with k heads is a pushdown automaton with k 1-way read heads on the input tape and a stack. It was previously shown that the deterministic variant of the model cannot accept all the context free languages. In this paper, we introduce a 2-tape, 2-head model namely Watson-Crick pushdown automata where the content of the second tape is determined using a complementarity relation, similar to Watson-Crick automata. We show computational powers of nondeterministic two-head pushdown automata and nondeterministic Watson-Crick pushdown automata are same. Moreover, deterministic Watson-Crick pushdown automata can accept all the context free languages.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
44965. Watt A.D., Stork, N.E. & Hunter, M.D. (eds.): Forest and insects
- Creator:
- Lepš, J.
- Type:
- article, model:article, and TEXT
- Language:
- English
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
44966. Wave probabilistic information power
- Creator:
- Svítek, Miroslav
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Wave probabilistic functions, wawe probabilistic circuits, wave information power, and quantum informatics
- Language:
- English
- Description:
- Paper summarizes the results in the area of information physics that is a new progressively developing field of study trying to introduce basics of information variables into physics. New parameters, like wave information flow, wave information/knowledge content or wave information impedance, are first defined and then represented by wave probabilistic functions. Next, relations between newly defined parameters are used to compute information power or to build wave information circuits covering feedbacks, etc.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
44967. Wave probabilistic models
- Creator:
- Svítek, Miroslav
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Wave propability, quantization principle, complementary variables, mathematical statistics, and quantum mechanics
- Language:
- English
- Description:
- The paper presents the basic theory of wave probabilistic models together with their features. By introduction of the complementarity's principle between x-representation and k-representation the probability theory is completed for "structural" parameter which carries information about the changes of time series or random processes. The next feature of wave probabilistic models is the quantization principle or definition of probabilistic inclusion-exclusion rules.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
44968. Wave probabilisties and quantum entanglement
- Creator:
- Svítek, Miroslav
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Probabilistic wave models, quantum system modeling, quantum informatics, entanglement, and pure and mixed quantum states
- Language:
- English
- Description:
- The paper continues with the theory of wave probabilistic models and uses the inclusion-exclusion rule to describe quantum entanglement as a wave probabilities resonance principle. The achieved results are mathematically described and an illustrative example is shown to demonstrate the possible applications of the presented theory.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
44969. Wavelet decomposition in the earth's gravity field investigation
- Creator:
- Bogusz, Janusz, Klos, Anna, and Kosek, Wieslaw
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, gravitace, zemětřesení, gravity, earthquake, GGP, wavelet decomposition, Earth’s gravity field changes, 7, and 551
- Language:
- English
- Description:
- This paper presents the results of the application of wavelet decomposition to processing data from the GGP sites (The Global Geodynamics Project). The GGP is an international project within which the Earth's gravity field changes are recorded with high accuracy at a number of stations worldwide using superconducting gravimeters. Data with a 5-second sampling interval from Wettzell and Bad Homburg were used for the research. The wavelet transform enables the investigation of the temporal changes of the oscillation amplitudes or the decomposition of the time series for the analysis of the required frequencies. The wavelet decomposition was performed using the regular orthogonal symmetric Meyer wavelet. The research concerned data from an earthquake period recorded at various locations and a quiet period when the gravimeters worked without any disturbances. The decomposition was followed by the Fast Fourier Transform for signal frequency components and then by correlation analyses of corresponding frequency components (for periods from 10 to 60 000 seconds) for all sensor combinations, for the quiet and the earthquake periods separately. Frequency components defining long term changes for all sensor combinations, as well as combinations between two sensors at the same site for the quiet days are characterised by high correlation coefficients. For the time of the earthquake, the Wettzell site data proved strong correlation for all frequency components, while the Bad Homburg site data showed an unexpected decrease of correlation for the majority of frequency components. The authors also showed that wavelet decomposition can be a good method of data interpolation, especially from the time of earthquakes. Moreover, it is a very useful tool for filtering the data and removing the noises., Janusz Bogusz, Anna Klos and Wieslaw Kosek., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
44970. Wavelet neural network as a multivariate calibration method in voltammetric electronic tongues
- Creator:
- Gutiérrez, J. M. , Moreno-Barón , L., del Valle, M., Leija, L., and Munoz, R.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Wavelet neural network, multivariate calibration, and electronic tongue
- Language:
- English
- Description:
- The paper presents a multi-output wavelet neural network (WNN) which, taking benefit of wavelets and neural networks, is able to accomplish data feature extraction and modeling. In this work, WNN is implemented with a feedforward one-hidden layer architecture, whose activation functions in its hidden layer neurons are wavelet functions, in our case, the first derivative of a Gaussian function. The network training is performed using a backpropagation algorithm, adjusting the connection weights along with the network parameters. This principle is applied to the simultaneous quantification of heavy metals present in liquid media, taking the cyclic voltammogram obtained with a modified epoxy-graphite composite sensor as departure information. The combination between processing tools and electrochemical sensors is already known as an electronic tongue.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public