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5512. Continuous extendibility of solutions of the Neumann problem for the Laplace equation
- Creator:
- Medková, Dagmar
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Neumann problem, Laplace equation, and continuous extendibility
- Language:
- English
- Description:
- A necessary and sufficient condition for the continuous extendibility of a solution of the Neumann problem for the Laplace equation is given.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5513. Continuous extendibility of solutions of the third problem for the Laplace equation
- Creator:
- Medková, Dagmar
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- third problem, Laplace equation, and continuous extendibility
- Language:
- English
- Description:
- A necessary and sufficient condition for the continuous extendibility of a solution of the third problem for the Laplace equation is given.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5514. Continuous feedback stabilization for a class of affine stochastic nonlinear systems
- Creator:
- Oumoun, Mohamed, Maniar, Lahcen, and Atlas, Abdelghafour
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- global asymptotic stability in probability, continuous state feedback, and control stochastic nonlinear systems
- Language:
- English
- Description:
- We investigate the state feedback stabilization, in the sense of weak solution, of nonlinear stochastic systems when the drift is quadratic in the control and the diffusion term is affine in the control. Based on the generalised stochastic Lyapunov theorem, we derive the necessary conditions and the sufficient conditions, respectively, for the global asymptotic stabilization in probability by a continuous feedback explicitly computed. The interest of this work is that the existing control methods are inapplicable to a lot of systems contained in the class of stochastic systems considered in this paper.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5515. Continuous field soil moisture content mapping by means of apparent electrical conductivity (ECa) measurement
- Creator:
- Nagy, Viliam, Milics, Gábor, Smuk, Norbert, Kovács, Attila József, Balla, István, Jolánkai, Márton, Deákvári, József, Szalay, Kornél D., Fenyvesi , László, Štekauerová, Vlasta, Wilhelm, Zoltán, Rajkai, Kálmán, Németh, Tamás, and Neményi, Miklós
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- moisture content mapping, apparent electrical conductivity, data preparation and interpolation, and precision agriculture
- Language:
- Slovak
- Description:
- A soil moisture content map is important for providing information about the distribution of moisture in a given area. Moisture content directly influences agricultural yield thus it is crucial to have accurate and reliable information about moisture distribution and content in the field. Since soil is a porous medium modified generalized Archie’s equation provides the basic formula to calculate moisture content data based on measured ECa. In this study we aimed to find a more accurate and cost effective method for measuring moisture content than manual field sampling. Locations of 25 sampling points were chosen from our research field as a reference. We assumed that soil moisture content could be calculated by measuring apparent electrical conductivity (ECa) using the Veris-3100 on-the-go soil mapping tool. Statistical analysis was carried out on the 10.791 ECa raw data in order to filter the outliers. The applied statistical method was ±1.5 interquartile (IRQ) distance approach. The visualization of soil moisture distribution within the experimental field was carried out by means of ArcGIS/ArcMAP using the inverse distance weighting interpolation method. In the investigated 25 sampling points, coefficient of determination between calculated volumetric moisture content data and measured ECa was R2 = 0.87. According to our results, volumetric moisture content can be mapped by applying ECa measurements in these particular soil types.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
5516. Continuous wavelet process neural network and its application
- Creator:
- Shisheng , Zhong, Yang, Li, Gang, Ding, and Lin , Lin
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Process neuron, continuous wavelet process neural network (CWPNN), learning algorithm, and aeroengine condition monitoring
- Language:
- English
- Description:
- In this paper, a continuous wavelet process neural network (CWPNN) model is proposed based on the wavelet theory and process neural network model. The network offers good compromise between robust implementations resulting from the redundancy characteristic of non-orthogonal wavelets, and efficient functional representations that build on the time-frequency localization property of wavelets. Moreover, the network can deal with continuous input signals directly. The corresponding learning algorithm is given and the network is used to solve the problems of aeroengine condition monitoring. The simulation test results indicate that the CWPNN has a faster convergence speed and higher accuracy than the same scale process neural network (PNN) and BP neural network. This provided an effective way for the problems of aeroengine condition monitoring.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5517. Continuum intensity and magnetic flux of solar fluxtubes
- Creator:
- del Toro Iniesta, J. C., Semel, M., Collados, M., and Sánchez Almeida, J.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- astrophysics, magnetic flux, and solar fluxtubes
- Language:
- Czech
- Description:
- The continuum contrast between fluxtubes and their quiet background, and the magnetic řlux carried by these magnetic elements, have been determined at different points of a solar facula, In the frame of a two-component model from spectropolarimetric observations of 1^11 spatial resolution. Local spatial variations of these two parameters have been obtained.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5518. Continuum spectrum for the linearized extremal eigenvalue problem with boundary reactions
- Creator:
- Takahashi, Futoshi
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- continuum spectrum, extremal solution, and boundary reaction
- Language:
- English
- Description:
- We study the semilinear problem with the boundary reaction −∆u + u = 0 in Ω, ∂u ∂ν = λf(u) on ∂Ω, where Ω ⊂ R N , N > 2, is a smooth bounded domain, f : [0, ∞) → (0, ∞) is a smooth, strictly positive, convex, increasing function which is superlinear at ∞, and λ > 0 is a parameter. It is known that there exists an extremal parameter λ ∗ > 0 such that a classical minimal solution exists for λ < λ∗ , and there is no solution for λ > λ∗ . Moreover, there is a unique weak solution u ∗ corresponding to the parameter λ = λ ∗ . In this paper, we continue to study the spectral properties of u ∗ and show a phenomenon of continuum spectrum for the corresponding linearized eigenvalue problem.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5519. Contnts
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- English
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5520. Contortionist, caricature and the grotesque body
- Creator:
- Winter, Tomáš
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Czech
- Description:
- Contortionist (1931) was one of the earliest oils created by the painter František Tichý during his five years in Paris. The painter returned to this subject matter in further works that reached their peak in paintings made in 1945. For Tichý, the Parisian period was a time of reassessment of his own style as a painter and the development of a highly individual technique based on Seurat-esque postimpressionism. Past interpreters of Tichý's works have already commented on certain elements of tension and ambivalence in his brushwork, enhanced by a particular treatment of light and building of space. Similar aspects are conveyed in the choice of subjects, including the contortionist. This article draws attention to historical examples of treatments of the contortionist figure and to links with the Devětsil movement, which shared with Tichý a strong fascination with circus. The article likewise shows that Tichý's contortionist figure is indebted to a bizarre drawing of two copulating homosexuals, its subversive quality further emphasised by scatological themes. Since Tichý produced other versions of the contortionist theme that allude to the act of excretion, this figure may be understood as a representative of the grotesque body as defined by Mikhail Mikhailovich Bakhtin. Tichý's work thus corresponds in certain points with the art of Jindřich Štyrský and the Surrealists, who were likewise attracted to scatological themes and also with the work of satirical draughtsmen and caricaturists, with a longer tradition of scatological subjects reaching back to the 16th century. Examples of period reviews demonstrate that Tichý's paintings were rich in associative meanings, akin to the perception of Surrealist works and the Surrealist discovery of concrete irrationality. Tichý's works oscillated between social critique in terms of subject matter, a personally engaged self-stylisation and a certain subversiveness that disrupted the conventional meanings of the individual themes. and Jedno z prvních pláten, která vytvořil František Tichý během svého pětiletého pobytu v Paříži, byl olej Hadí muž (1931). Tomuto motivu se malíř věnoval i v dalších pracích, vrcholících obrazy z roku 1945. Pařížské období znamenalo pro Tichého přehodnocení jeho malířského rukopisu a nalezení osobité techniky, vycházející ze seuratovského postimpresionismu. Již předešlí interpreti Tichého tvorby odhalili v jeho štětcové technice prvky napětí a ambivalence, podpořené specifickým zacházením se světlem a budováním prostoru. Tyto momenty se přenášejí i do obsahu ztvárňovaných námětů včetně hadího muže. Článek poukazuje na historické příklady zachycení této figury a na spojitosti s hnutím Devětsil, v němž hrála stejně jako u Tichého významnou roli inspirace cirkusem. Současně dokládá, že pro genezi Tichého hadího muže byla podstatná bizarní kresba dvou souložících homosexuálů, jejíž podvratnost byla ještě zvýrazněna skatologickou tematikou. Jelikož některé další Tichého postavy hadího muže odkazují k aktu exkrece, můžeme tuto figuru chápat jako reprezentanta groteskního těla, jak ho definoval Michail Michajlovič Bachtin. Tichý se tak v určitých bodech stýkal s tvorbou Jindřicha Štyrského a surrealistů, kteří byli skatologickými motivy rovněž přitahováni. Podobně tomu bylo také u satirických kreslířů a karikaturistů, kde však měla skatologická tematika delší tradici, sahající do 16. století. Příklady dobové recepce dokládají, že Tichého obrazy navozovaly asociativní významy, nikoli nepodobné vnímání surrealistické tvorby a surrealistickému objevování konkrétní iracionality. Tichého plátna oscilovala mezi sociálně-kritickým obsahem, osobně angažovanou autostylizací a určitou podvratností, narušující konvenční význam jednotlivých motivů.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public