We have been asked to design and manufacture a wide-field and fast photographic camera for many times in the past. The manufacture of these devices mostly was not realized because the customers finally bought a commercial Newtonian telescope and fitted it by a field corrector. The manufacture of a fast first class camera requires great accuracy and takes a lot of time. That is the main reason why the prices of these devices are very high. The good results can be obtained with the cameras based on the aspherical plates of commercial Schmidt-Cassegrain telescopes. In this paper we publish several designs of optical systems composed of a corrector plate of commercial eight inch Schmidt-Cassegrain telescope and a new mirror part. and V minulosti jsme byli mnohokrát žádáni o návrh a výrobu světelné širokoúhlé fotografické komory. Výroba těchto přístrojů nebyla realizována, protože zákazníci si nakonec koupili komerční Newtonův dalekohled a vybavili jej korektorem pole. Výroba kvalitní světelné komory vyžaduje vysokou přesnost optické a mechanické práce a zabere mnoho času. To je hlavní důvod, proč jsou ceny těchto přístrojů vysoké. Dobré výsledky mohou být získány s komorami založenými na asférických deskách komerčních Schmidtových-Cassegrainových dalekohledů. V této práci publikujeme několik návrhů optických přístrojů s korekční deskou komerčního osmipalcového dalekohledu typu Schmidt-Cassegrain a nově dopočítané zrcadlové části.
Cassini a Richer zjistili paralaktický posuv polohy Marsu vzhledem k hvězdám v průběhu opozice v roce 1672 ze dvou míst na Zemi (Paříž, Cayenne). Současně Cassini nalezl paralaxu Marsu poledníkovou metodou a vypočítal vzdálenost Země od Marsu a Slunce. Současně Flamsteed stanovil paralaxu Marsu užitím metody denní paralaxy a obdržel stejný výsledek., Cassini and Richer measured the parallax shift position of Mars relative to nearby stars during opposition form two points on the Earth (Paris, Cayenne) in 1672. Subsequently Cassini found the parallax of Mars by the meridian method and computed the distance from the Earth to Mars and the Sun. Flamsteed determined the parallax of Mars using the method of diurnal parallax with the same result simultaneously., Vladimír Štefl., and Obsahuje seznam literatury
To address the issue of water eutrophication and to use water more effectively, we conducted experiments on rice (Oryza sativa L.) grown in floating culture. From 2009 to 2011, we compared the photosynthesis and root characteristics of the rice, hybrid line Zhuliangyou 02, grown under a conventional tillage and in a floating culture in Huaihua, the home of hybrid rice. Rice in the floating culture showed a higher net photosynthetic rate and stomatal conductance than that under the conventional tillage. The activities of phosphoenolpyruvate carboxylase and NADP-malic enzyme were 32 and 28% higher, respectively, in rice in the floating culture than under the conventional tillage. Rice in the floating culture also showed significantly greater number of roots, root activity, and antioxidant enzyme activity than that under the conventional tillage. Compared with rice under the conventional tillage, rice in the floating culture had 18 and 24% higher tiller number and effective panicle number, respectively. These results suggested that the floating culture system can promote rice production through enhancing root absorption, increasing effective panicle number, and improving the photosynthetic rate. In addition, rice cultivated in the floating culture could remove excess nutrients from water, which addresses the problems of a lack of arable land and water pollution., H.-X. Wu ... [et al.]., and Obsahuje bibliografii
Path planning problem in mobile robotics can be solved in several ways. Often used are probabilistic roadmaps and potential field algorithm. However, adding nonholonomic constraints into part planning algorithm can be difficult for those methods. Therefore the rapidly exploring random trees (RRT) algorithm was examined and paper illustrates its usability in path planning task for both legged (walking) and wheeled mobile robots. The method proved to be capable of coping with limiting constraints and at the same time it is very fast, enabling its use in real time path recalculation when used with localization algorithm. and Obsahuje seznam literatury