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Start Over Coverage 71-81 Harvested from CDK Harvested from CDK Data provider Academy of Sciences Library/Knihovna Akademie věd ČR

2. On the role of rock fragments and initial soil water content in the potential subsurface runoff formation

Creator:
Hlaváčiková, Hana, Novák, Viliam, and Holko, Ladislav
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
stony soils, infiltration, stoniness, initial soil water content, and mathematical modeling
Language:
Slovak
Description:
Stony soils are composed of fractions (rock fragments and fine soil) with different hydrophysical characteristics. Although they are abundant in many catchments, their properties are still not well understood. This article presents basic characteristics (texture, stoniness, saturated hydraulic conductivity, and soil water retention) of stony soils from a mountain catchment located in the highest part of the Carpathian Mountains and summarizes results of water flow modeling through a hypothetical stony soil profile. Numerical simulations indicate the highest vertical outflow from the bottom of the profile in soils without rock fragments under ponding infiltration condition. Simulation of a more realistic case in a mountain catchment, i.e. infiltration of intensive rainfall, shows that when rainfall intensity is lower than the saturated hydraulic conductivity of the stony soil, the highest outflow is predicted in a soil with the highest stoniness and high initial water content of soil matrix. Relatively low available retention capacity in a stony soil profile and consequently higher unsaturated hydraulic conductivity leads to faster movement of the infiltration front during rainfall.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Oscillation criteria for nonlinear differential equations with p(t)-Laplacian

Creator:
Shoukaku, Yutaka
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
p(t)-Laplacian, oscillation theory, and Riccati inequality
Language:
English
Description:
Recently there has been an increasing interest in studying p(t)-Laplacian equations, an example of which is given in the following form (|u ′ (t)| p(t)−2 u ′ (t))′ + c(t)|u(t)| q(t)−2 u(t) = 0, t > 0. In particular, the first study of sufficient conditions for oscillatory solution of p(t)-Laplacian equations was made by Zhang (2007), but to our knowledge, there has not been a paper which gives the oscillatory conditions by utilizing Riccati inequality. Therefore, we establish sufficient conditions for oscillatory solution of nonlinear differential equations with p(t)- Laplacian via Riccati method. The results obtained are new and rare, except for a work of Zhang (2007). We present more detailed results than Zhang (2007).
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

4. Polarization of light of the comets Arend-Roland (1956h) and Mrkos (1957d)

Creator:
Blaha, M., Hruška, A., Švestka, Z., and Vanýsek, V.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
measurements, polarization of light, and comets
Language:
Czech
Description:
This paper presents measurements of the polarization of light in the tails of the comets Arend-Roland and Mrkos, made in the total photographic light. Results given in Tables II and V indicate that the tail of the Arend-Roland comet contained a substantial dust component, while the polarization in the tail of the Mrkos comet can be explained predominantly by pure molecular emission.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public