L'application d'une méthode basée sur la théorie météorique d'Öpik permet de confirmer les résultats de sondages crépusculaires de la haute atmosphère en ce qui concerne le faible gradient de densité. Sa variation saisonière a pu être mise en évidence. En outre cette méthode permet d'étudier les différentes catégories de météorites, dont une fut inconnue jusqu'à présent. Les assaims météoriques (Perséídes et Léonides ne se distinguent pas essentiellement de météores sporadiques. and Sloučením Öpikovy theorie svícení meteorů a autorovy theorie soumrakových zjevů podařilo se:
a) ověřit výsledky týkajíí se hustot vzduchu v ionosféře a jejího malého gradientu, b) ukázati, že gradient hustoty vzduchu je v létě větší než v zimě, což by se dalo interpretovati nižší tepúlotou v létě než v zimě, c) vedle existence železných a kamenných meteoritů byla nalezena též nová dosud neznámá kategorie lišící se buď tepelnými vlastnostmi nebo odlišným mechanismem svícení, než jaký předpokládá Öpik. K těmto poznatkům lze dospěti jen ze stanovení výšek zažehnutí a zhasnutí meteorů, což ukazuje na důležitost amatérských pozorování toho druhu pěstovaných ve větším měřítku dosud jen ve Spojených státech a v Anglii.
This paper is dealing with a detection of ground water flow in a granite massif. The flow was studied between boreholes of a testing polygon situated in a granite quarry. So called cross-hole (C-H) tests were used to detect fracture based connection between the boreholes. The tests were proceeded in steady-state ground water flow conditions. There were TV cameras used to detect a uranine tracer. The cameras were equipped by an orange filter and well defined blue light. A geometrical model of the fracture system in the area of interest was proposed according to C-H tests data. A hydrogeological model was calibrated using the very same data. Results pointed out subhorizontal fracture connection between the boreholes. Main advantages of the TV camera usage are possibil ities of accurate localization onto a structure, an immediate detection of tracer onset time and a continual data record., Karel Sosna, Milan Brož, Michal Vaněček and Michal Polák., and Obsahuje bibliografické odkazy
a1_In the present study, the effect of the medial septal (MS) lesions on exploratory activity in the open field and the spatial and object recognition memory has been investigated. This experiment compares three types of MS lesions: electrolytic lesions that destroy cells and fibers of passage, neurotoxic -ibotenic acid lesions that spare fibers of passage but predominantly affect the septal noncholinergic neurons, and immunotoxin - 192 IgG -saporin infusions that only eliminate cholinergic neurons. The main results are: the MS electrolytic lesioned rats were impaired in habituat ing to the environment in the repeated spatial environment, but rats with immuno - or neurotoxic lesions of the MS did not differ from control ones; the MS electrolytic and ibotenic acid lesioned rats showed an increase in their exploratory activity to the objects and were impaired in habituating to the objects in the repeated spatial environment; rats with immunolesions of the MS did not differ from control rats; electrolytic lesions of the MS disrupt spatial recognition memory; rats with immuno - or neurotoxic lesions of the MS were normal in detecting spatial novelty; all of the MS - lesioned and control rats clearly reacted to the object novelty by exploring the new object more than familiar ones. Results observed across lesion techniques indicate that: (i) the deficits after nonselective damage of MS are limited to a subset of cognitive processes dependent on the hippocampus, (ii) MS is substantial for spatial, but not for object recognition memory - the object recognition memory can be supported outside the septohippocampal system; (iii) the selective loss of septohippocampal cholinergic or noncholinergic projections does not disrupt the function of the hippocampus to a sufficient extent to impair spatial recognition memory;, a2_(iv) there is dissociation between the two major components (cholinergic and noncholinergic) of the septohippocampal pathway in exploratory behavior assessed in the open field - the memory exhibited by decrements in exploration of repeated object presentations is affected by either electr olytic or ibotenic lesions, but not saporin., M. G. Dashniani, M. A. Burjanadze, T. L. Naneishvili, N. C. Chkhikvishvili, G. V. Beselia, L. B. Kruashvili, N. O. Pochkhidze, M. R. Chighladze., and Obsahuje bibliografii
The Czech Academy of Sciences (CAS) has contributed to the success of the Czech pavilion at the World EXPO 2015 in Milan, the motto of which is: Feeding the Planet: Energy for Life. The motto was also reflected in the nine Days of Czech Science, held in early July under the partnership of the Joint Research Centre in Ispra. Several institutes of the CAS presented results of their most recent discoveries. The Institute of Organic Chemistry and Biochemistry, among others, displayed its research aimed at seeking new human medications for lifestyle diseases and showed, for instance, a human cell as a miniature “chemical plant” in which thousands of actions bring about the healthy functioning of an organism. The institute also prepared an exhibition entitled Czech Science fighting viruses, which also introduced one of the protagonists in this field, outstanding Czech scientist Antonín Holý.One of the Czech lecturers who addressed the audience both at the EXPO and in Ispra was Lenka Maletínská. She focused on the potential role of modified neuropeptides in the fight against obesity, which is also explained in the article by Lenka Maletínská and Jaroslav Kuneš in this edition. and Marina Hužvárová.
We consider the large time behavior of a solution of a parabolic type equation involving a nonlocal term depending on the unknown function. This equation is proposed as a mathematical model of carbon dioxide transport in concrete carbonation process, and we proved the existence, uniqueness and large time behavior of a solution of this model. In this paper, we derive the exponential decay estimate of the solution of this model under restricted boundary data and initial data.
In the present paper, based on the concept of fuzzy entropy, an exponential intuitionistic fuzzy entropy measure is proposed in the setting of Atanassov's intuitionistic fuzzy set theory. This measure is a generalized version of exponential fuzzy entropy proposed by Pal and Pal. A connection between exponential fuzzy entropy and exponential intuitionistic fuzzy entropy is also established. Some interesting properties of this measure are analyzed. Finally, a numerical example is given to show that the proposed entropy measure for Atanassov's intuitionistic fuzzy set is consistent by comparing it with other existing entropies.
Connections between uniform exponential expansiveness and complete admissibility of the pair $(c_0({\mathbb N}, X),c_0({\mathbb N}, X))$ are studied. A discrete version for a theorem due to Van Minh, Räbiger and Schnaubelt is presented. Equivalent characterizations of Perron type for uniform exponential expansiveness of evolution families in terms of complete admissibility are given.
This paper is concerned with the exponential H∞ filter design problem for stochastic Markovian jump systems with time-varying delays, where the time-varying delays include not only discrete delays but also distributed delays. First of all, by choosing a modified Lyapunov-Krasovskii functional and employing the property of conditional mathematical expectation, a novel delay-dependent approach is developed to deal with the mean-square exponential stability problem and H∞ control problem. Then, a mean-square exponentially stable and Markovian jump filter is designed such that the filtering error system is mean-square exponentially stable and the H∞ performance of estimation error can be ensured. Besides, the derivative of discrete time-varying delay h(t) satisfies h˙(t)≤η and simultaneously the decay rate β can be finite positive value without equation constraint. Finally, a numerical example is provided to illustrate the effectiveness of the proposed design approach.
We consider inequalities between sums of monomials that hold for all p-Newton sequences. This continues recent work in which inequalities between sums of two, two-term monomials were combinatorially characterized (via the indices involved). Our focus is on the case of sums of three, two-term monomials, but this is very much more complicated. We develop and use a theory of exponential polynomial inequalities to give a sufficient condition for general monomial sum inequalities, and use the sufficient condition in two ways. The sufficient condition is necessary in the case of sums of two monomials but is not known if it is for sums of more. A complete description of the desired inequalities is given for Newton sequences of less than 5 terms., Charles R. Johnson, Carlos Marijuán, Miriam Pisonero, Michael Yeh., and Obsahuje seznam literatury