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Papers 24,908 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
Stylistické kvalifikátory v Akademickém slovníku současné češtiny
Lišková, Michaela
Text se zabývá stylistickými kvalifikátory v Akademickém slovníku současné češtiny. Představuje jejich koncepční repertoár: 1. stylistické kvalifikátory v užším smyslu (kolokviální výraz, knižní výraz, slangový a profesionální výraz ad.), 2. kvalifikátory označující expresivitu a emocionalitu (hanlivý výraz, vulgární výraz, zjemnělý výraz, dětský výraz ad.), 3. časové kvalifikátory (historismus, zastaralý výraz), 4. teritoriální kvalifikátory (regionalismus, dialektismus) a konečně 5. frekvenční kvalifikátor (řidší výraz). Zvolené kvalifikátory navazují na českou lexikografickou tradici a dílčím způsobem ji modifikují.
Correspondence of abbess Dorothy from Krumlov
Hejdová, Tereza
The article focuses on Dorota from Krumlov and her activity in the posts of abbess of two convents – the convent of Poor Clares in Panenský Týnec and the Benedictine convent of Saint George in the Prague Castle. It describes the historical context and explains the possible transfer of abbess among the monastic communities. The largest space is dedicated to the linguistic analysis of the remaining letters of Dorota from Krumlov from the both convents – through phonology and morphology gets to the stylistic level.
Quick determination of compounds contained in caraway (Carum carvi L.) by a method usable in agricultural practice
Horáčková, L. ; Pluháčková, H. ; Bradáčová, M. ; Kudláčková, Barbora
Caraway is a very important agricultural commodity whose quality is determined by parameters such as dry matter, essential oil content and composition, especially the ratio of its two major components carvone and limonene. Appropriate method for their analysis is given in the Cesky lekopis (2017); however, this method is rather time-consuming, costly and demands large quantity of sample. The use of a NIR spectrometer could be a viable alternative; it is much faster and cheaper, as can be clearly seen from the comparison of both methods in this paper. In the time aspect, it's saving from many hours to a few minutes. Newly presented method could potentially be more accessible to agricultural companies who need quick quality verification of their product before taking it to the market from the viewpoint of final product quality not just the quantity, which, in most cases, is nowadays a current state of practice.
“To miss out on the Region, the People and Life because of Castles and Ruins…” Tensions between Historicism and Regionalism using Zbudovská Blata as an Example
Hrdina, Martin
The region of Zbudovská Blata including its residents became known throughout Czech society at the beginning of the 20th century mainly thanks to the efforts of writers K. Klostermann and J. Holeček. The purpose of this essay is to recall the key circumstance of the literal presentation of the rural environment, which was a departure from romantic historicism of the 19th century, and to describe the role which the writers above bestowed upon the Blata residents in the context of Czech-speaking society. While Holeček used the Blata surroundings for purposes of a multifaceted polemic with the aristocracy, the conciliatory Klostermann created a timeless symbol from that same environment, thanks to which he secured a permanent place in Czech culture with his novel Mlhy na Blatech (Mist over Blata).
X-Ray CT inspection of subsurface areas of concretes exposed to fast flowing liquids
Sitek, Libor ; Hlaváček, Petr ; Souček, Kamil ; Bodnárová, L. ; Foldyna, Josef ; Zajícová, Vendula ; Berčáková, Andrea ; Foldyna, Vladimír
Concrete structures affected for a long time by flowing liquids are exposed to gradual erosion in surface layers caused by a combination of several degradation processes: abrasion, cavitation and chemical or bacterial impacts. Due to the complex phenomena and difficult-to-define initial and boundary conditions, the whole process cannot be easily simulated using the conventional computing tools. Laboratory experimental research is thus the most appropriate approach for the investigation of a suitable composition of concrete resistant to the flowing liquids. However, the methods used are often very time consuming and last even several years. High-speed water flows can be elegantly used for the acceleration of the mechanical simulation of a real situation. Several experiments on the effects of the high-speed water flows on concrete surfaces have been carried out. Using the X-Ray CT methods, subsurface structures of concretes exposed to the accelerated mechanical simulation of the erosion wear caused by fast flowing liquids were investigated and presented in the article. It has been shown that the simulation does not cause initiation of new fractures or cracks in the original concrete structure. The pure water flow mainly removes the hardened cement paste and reveals the aggregate grains. The water flow with abrasive particles disintegrates in greater depths and washes out entire aggregate grains, eventually amputates them and finally smoothens entire surface.
DNA damage induced by occupational exposure to copper oxide nanoparticles
Rössner st., Pavel ; Pelcová, D. ; Elzeinová, Fatima ; Mikuška, Pavel ; Večeřa, Zbyněk ; Coufalík, Pavel ; Vlčková, Š. ; Fenclová, Z. ; Rossnerová, Andrea
Copper oxide nanoparticles (CuO NPs) have a widespread use in industry, chemistry, in production of electronic devices and as an antimicrobial agent. Although copper is an important biogenic element, CuO NPs are toxic with the ability to induce oxidative stress, apoptosis, cell cycle arrest or DNA damage. For humans, the inhalation route is the most common way of exposure to CuO NPs. In the body, CuO NPs may be either deposited in the lungs, or transported to other organs. Their presence usually causes oxidative stress or inflammatory responses, consequently leading to DNA damage. In this study, we investigated the effect of CuO NPs inhalation on DNA damage in a group of researches conducting animal exposure experiments. The subjects were exposed to various metal oxide nanoparticles, including CuO NPs, by inhalation for an average of 4.9 ± 0.4 years. The average mass concentration of Cu in the air during the experiment was 7.3 ± 3.2 ng/m3. Subjects not exposed to nanoparticles served as a control group. We applied micronucleus assay using Human Pan Centromeric probes to detect DNA damage and to distinguish between the frequency of centromere positive (CEN+) and centromere negative (CEN−) micronuclei (MN) in the binucleated cells. We\ndid not find differences between both groups for either mean MN frequency (10.38 ± 2.50 vs. 11.88 ± 3.01 MN/1000 binucleated cells), or CEN+/CEN- ratio (58%/42% vs. 55%/45%), for the exposed and controls, respectively. In conclusion, inhalation of CuO NPs at this low-level exposure had no effect on chromosomal losses and/or breaks.
Photon-upconversion scanner for multiplexed imaging
Hlaváček, Antonín ; Křivánková, Jana ; Foret, František
In analytical chemistry, multiplexed assays facilitate parallel detection of analytes. The multiplexing reduces the consumption of sample, reagents, and other resources and can be applied for medical diagnostics, the studies of biomolecule interactions, single-cell and singlemolecule assays, environmental monitoring, pathogen detection, multiparameter chemical and biological assays and screening of chemical libraries.
A critical review of paradoxes in the special theory of relativity
Křížek, Michal
We show that the Doppler effect and aberration of light can produce more dominant and entirely opposite effects for relativistic speeds than those predicted by the Special Theory of Relativity, in particular, the clock paradox, time dilatation, and length contraction. For instance, an observer will measure a higher frequency of an approaching clock than the same clock has at rest. We also prove that under certain conditions an approaching bar on a photo may seem to have a larger length for a relativistic speed than at rest.
Excessive extrapolations of Einstein's equations
Křížek, Michal ; Somer, L.
The standard cosmological model is surprisingly quite thoroughly investigated even though it possesses many paradoxes. We present several arguments indicating why excessive extrapolations of Einstein's equations to cosmological distances are questionable. First, we show how to express explicitly the first of Einstein's 10 partial differential equations to demonstrate their extremely large complexity. Therefore, it would be very difficult to find their solution for two or more bodies to model, e.g., the evolution of the Solar system. Further, we present some unexpected failures of the Schwarzschild and Friedmann solution of these equations. Then we explain why application of Einstein's equations to the whole universe represents incorrect extrapolations that lead to dark matter, dark energy, and several unrealistic situations. Finally, we give 10 further arguments showing why celebrated Einstein's equations do not describe reality well.

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