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Start Over Coverage 175-180 Data provider Academy of Sciences Library/Knihovna Akademie věd ČR

1. Improving of the SLR measurement accuracy by determination of the pulse center of mass

Creator:
Neumann, Z.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
scientific research, measurement accuracy, and pulse center of mass
Language:
Czech
Description:
In the case of the 30 ns long laser pulses the jitter of distances of the pulse centers of mass is less than the jitter of distances when using the threshold discriminator. The paper describes an analog case of determination of the pulse center of mass.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Specific features of water infiltration into soil with different management in winter and early spring period

Creator:
Hejduk, Stanislav and Kasprzak, Klaudius
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
infiltration, cryopedosphere, surface runoff, thawing and freezing, soil tillage, grassland, infiltrace, kryopedosféra, povrchový odtok, tání a mrznutí, obdělávání půdy, and travní porost
Language:
Slovak
Description:
The paper deals with the effects of agricultural soils management on surface runoff in winter and early spring period. Cryogenic processes that take place in soils can cause temporary reduction of infiltration capacity of soil. In the periods of snow-thawing and rain these phenomena induce conditions promoting the occurrence of surface runoff and floods. Effects of agricultural soils management on surface runoffs were studied at the research station in BrnoKníničky, Czech Republic, from 1965 to 2002. The aim of this research was to find out the differences between the winter surface runoff from experimental plots under winter wheat crop sown after plowing and under perennial forage crops without tillage. On soils without plowing, the decrease of soil infiltration rate occurred faster and was more intensive than on loose soils. During ten winter periods the average surface runoff from perennial forages was significantly higher (2.05 times) than from wheat crop (runoff coefficients 0.239 vs. 0.489). and Příspěvek se zabývá hodnocením vlivu kultivace zemědělských půd na povrchové odtoky v zimním a předjarním období. Kryogenní procesy v půdách mohou způsobovat dočasnou redukci jejich infiltrační rychlosti. V obdobích tání sněhu a dešťů vytváří podmínky pro výskyt povrchového odtoku a povodní. V letech 1965-2002 byl sledován na výzkumné stanici v Brně-Kníničkách vliv kultivace zemědělských půd na povrchové odtoky. Cílem tohoto výzkumu bylo najít rozdíly mezi zimními povrchovými odtoky z pokusných ploch s ozimou pšenicí vysetou po orbě a s víceletými pícninami bez zpracovaní půdy. Na půdách bez orby došlo k redukci infiltrační rychlosti rychleji a tato redukce byla intenzivnější než na kyprých půdách po orbě. Během deseti hodnocených zimních období byl povrchový odtok z víceletých pícnin průkazně vyšší (2,05 krát) než z pšenice. Průměrný koeficient povrchového odtoku u ozimé pšenice dosáhl hodnoty 0,239 a u víceletých pícnin 0,489.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. The influence of Bernoulli's effect on the function of the vocal cords

Creator:
Hrůza, Václav
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
vocal cords, Bernoulli's effect, fluid-structure interaction, suction, and frequency
Language:
English
Description:
This research is a follow-up to the previous research which was dealing with the creation of the simulation of the vocal cords function using FEM. This paper focuses on how the vocal cords function is affected by Bernoulli's effect, while using model [1] is used. It is well known, that Bernoulli's effect is connected with the suction in the air space between the vocal cords. This is caused by the high air flow in glottis. The fastest and easiest way how to eliminate the influence of this effect is the change of every negative air pressure on the vocal cords to zero (i.e. the pressure applied as the loads on the vocal cords). Authors of some vocal cords models presume that Bernoulli's effect is the main force causing vocal cords vibrations. Changing the negative pressures to zero should cause that the vocal cords would not vibrate. However, the results of this research show the opposite. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Ve filozofii jen "sváteční střelec"?: přírodovědec Ernst Mach jako oborově přeshraniční pendler. Část 1

Creator:
Stadler, Friedrich and Černohorský, Martin
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
Mach, Ernst, 1838-1916, 19.-20. století, fyzici, teorie vědy, filozofové, physicists, theory of science, philosophers, Česko, Czechia, 6, and 53
Language:
Czech, English, and German
Description:
Ernst Mach was already an internationally recognised experimental physicist, when he, after professorships for Mathematics and Physics in Graz and Experimental Physics in Prague, took over the chair for "Philosophy, particularly for the History and Theory of the Inductive Sciences", at the University of Vienna in 1895. This turn from natural sciences to philosophy was really an exception in the academic field. Although he was not a specialist in philosophy his ideas exhibited a remarkable influence. Here is the first part of the author's text, the second, closing part (Mach and Philosophy) will be published in the next issue of this Journal., Friedrich Stadler ; z angličtiny a němčiny přeložil M. Černohorský., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public