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2. Comparison of two procedures for determination of stability boundary
- Creator:
- Půst, Ladislav and Kozánek, Jan
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- identification of dynamic model, stability, linear system, comparison of numerical methods, eigenvalue problem, and Runge Kutta solution
- Language:
- English
- Description:
- Analysis of two methods used for ascertaining stability of dynamical systems was carried out on a mathematical model of experimental stand of aerodynamic bearings. It was proofed that method of direct eigenvalue calculation gives practically the same results, which are obtained from the solution of equations of motion by means of integral Runge Kutta procedure. and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. Critical case of nonlinear Schrödinger equations with inverse-square potentials on bounded domains
- Creator:
- Suzuki, Toshiyuki
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- energy method, nonlinear Schrödinger equation, inverse-square potential, and Hardy-Poincaré inequality
- Language:
- English
- Description:
- Nonlinear Schrödinger equations (NLS)a with strongly singular potential a|x| −2 on a bounded domain Ω are considered. If Ω = R N and a > −(N − 2)2 /4, then the global existence of weak solutions is confirmed by applying the energy methods established by N. Okazawa, T. Suzuki, T. Yokota (2012). Here a = −(N − 2)2 /4 is excluded because D(P 1/2 a(N) ) is not equal to H 1 (R N ), where Pa(N) := −∆ − (N − 2)2 /(4|x| 2 ) is nonnegative and selfadjoint in L 2 (R N ). On the other hand, if Ω is a smooth and bounded domain with 0 ∈ Ω, the Hardy-Poincaré inequality is proved in J. L. Vazquez, E. Zuazua (2000). Hence we can see that H 1 0 (Ω) ⊂ D(P 1/2 a(N) ) ⊂ H s (Ω) (s < 1). Therefore we can construct global weak solutions to (NLS)a on Ω by the energy methods.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
4. Post-embryonic development of Camallanus cotti (Nematoda: Camallanidae), with emphasis on growth of some taxonomically important somatic characters
- Creator:
- Levsen, Arne and Berland, Bjørn
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Nematoda, Camallanus cotti, post-embryonic development, post-maturational growth, and taxonomy
- Language:
- English
- Description:
- In this paper, the quantitative post-embryonic development of the Asian freshwater fish nematode Camallanus cotti Fujita, 1927, is described. Larval and adult morphometrics were obtained by following the parasite's life cycle experimentally using copepods Macrocyclops albidus (Jurine) as intermediate host and guppies Poecilia reticulata (Peters), southern platyfish Xiphophorus maculatus (Günther) and paradise fish Macropodus opercularis (L.) as definitive host. Additionally, adult worms were obtained from heavily infected paradise fish imported from Singapore. It is suggested that the gradual change in proportions of the worm's somatic body parts reflects the specific ecological role of each developmental stage. The free-living infective first-stage larva seems to be adapted for transmission, as indicated by its relatively long tail, designed to generate host-attracting movements, and its non-functional intestine. The second- and third-stage larvae from the copepod intermediate host seem mainly to invest in trophic functionality, i.e., the development of the buccal capsule and the oesophagus, which are crucial structures for the worm's successful establishment in the definitive fish host. Once in the fish intestine, the larvae enter a period of considerable growth. After the fourth (i.e., last) moult, a 72% increase in average female body length occurs. This is accompanied by doubling the average vulva-tail tip distance and the average tail length. The length of the female hind body expands in an accelerating allometric fashion, and seems to be closely linked to the posterior-wards expansion of the uterus. In the males however, growth seems to cease after the final moult. We conclude that female post-maturational body size, but especially the length of the hind body and the tail, are closely related to reproductive state, i.e., the developmental stage of the offspring in the uterus, and, probably, the worms' age. Any future taxonomical studies of camallanids in general, and C. cotti in particular, should thus be aware of the reproductive state of the females used.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
5. Převod řeči do nemluvení a translace ticha do slov aneb Dramatická tvorba Věry Linhartové
- Creator:
- Jungmannová, Lenka
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- Czech
- Description:
- Článek se zabývá rozhlasovými hrami Věry Linhartové a zmiňuje se i o jejich inscenacích. Autorka demonstruje, že hlavním prostředkem výpovědi obou dramat se stává jazyk, který spisovatelka vždy zkoumá ve vztahu k člověku. První část textu sleduje osobitou kritiku „logocentrismu“ v dramatu Překladatel (1969), kde je nastavena paralela mezi aktem překládání a existencí člověka v ontologickém smyslu. Druhá část textu interpretuje Linhartové hledání hranic racionální reprezentace. Drama Přesýpací hodina (1970) totiž zobrazuje lidské myšlení jako palimpsest, který bez možnosti řeči přichází o své metafyzické kvality. Stať dále rozebírá experimentální podstatu her, založenou na minimalistické dějové kompozici, konceptuálně formulovaných postavách a „abstraktním“ časoprostoru, a také spisovatelčin experiment s bytostností literárního díla určeného pro rozhlas, když v dramatech tematizuje problém performativnosti slovního vyjadřování. and The article discusses two radio plays by Věra Linhartová (b. 1938), including their performance. It demonstrates that the chief means of utterance in both plays becomes the language that Linhartová always explores in relation to man. The first part of the text considers the distinctive critique of 'logocentrism' in the play Překladatel (The Translator, 1969), in which a parallel is posited between the act of translating and man considered ontologically. The second part of the article interprets Linhartová's search for the boundaries of rational representation. The play Přesýpací hodina (The Hourglass, 1970) depicts human thinking as a palimpsest, which, when deprived of the possibility of speech, loses its metaphysical quality. The article also analyses the experimental essence of the plays, which consists in their minimalistic plots, conceptually formulated characters, and 'abstract' settings, but also the playwright's experiment with the essentiality of a literary work intended for radio broadcast, when in her dramas she thematizes the problem of the performativity of verbal expression.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public