Autor: Čermák, Jan - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the delay differential equation y(x) = ay(τ(x)) + by(x)
Autorzy:: Čermák, Jan
Powiązania:: https://bibliotekanauki.pl/articles/1294107.pdf
Data publikacji:: 1999
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: functional differential equation
functional (nondifferential) equation
asymptotic behaviour
Opis:: The paper discusses the asymptotic properties of solutions of the scalar functional differential equation
$y'(x) = ay(τ(x)) + by(x), x ∈ [x_0,∞]$.
Asymptotic formulas are given in terms of solutions of the appropriate scalar functional nondifferential equation.
Źródło:: Annales Polonici Mathematici; 1999, 71, 2; 161-169
0066-2216
Pojawia się w:: Annales Polonici Mathematici
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Above- and below-ground tree parameters and their development after modelling of thinning in young elm stands
Autorzy:: Šrámek, Martin
Hurt, Václav
Čermák, Jan
Powiązania:: https://bibliotekanauki.pl/articles/956995.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: elm
leaf area
absorptive root area
biomass
thinning
Opis:: During the last century almost two-thirds of all elms were lost due to the Dutch elm disease. Therefore, elms are an endangered species with a lasting lack of knowledge about ecosystem functions of elms in forest stands. The study describes several above- and below-ground tree parameters and their changes after simulation of thinning in one young forest stand with dominant Ulmus laevis Pall. in the Czech Republic. The distribution of the leaves was measured using the ‘cloud’ technique. The absorptive root area was measured with the aid of the modified earth impedance method to evaluate below-ground tree parameters. Using allometric equations, it was possible to calculate certain tree parameters of individual trees as well as the entire forest stand. The modelling of four thinning intensities (low, medium, high and very high) helped to establish the changes of these tree parameters after treatment. The leaf area index of the stand was 5.6, the absorptive root area index was 1.7 and the total biomass of foliage was 8.5 Mg ha–1 prior to the treatment. The absorptive root area amounted to 30% of the foliage area. The exponential models were developed to predict the above- and below-ground tree parameters. Under the different thinning intensities, the following were found: a negative correlation with the number of trees for the leaf area index, the foliage biomass and the absorptive root area index. This knowledge is important in the process of maintaining the presence of endangered elms in forest stands and in ecosystem services (e.g. carbon storage) throughout Europe.
Źródło:: Dendrobiology; 2017, 77; 77-90
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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