Temat: different method - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: “gcdAlpha” – a semi-analytical method for solving fractional state equations
Autorzy:: Sowa, M.
Powiązania:: https://bibliotekanauki.pl/articles/377385.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: semi-analytical method
fractional derivative
circuit analysis
different orders
Opis:: The paper discusses a semi-analytical method for solving systems of fractional state equations with various orders. The method bases on an expansion of the system into one where there is a single derivative order. The formulation of the matrices of the new system is explained in detail. Another characteristic feature of the method is also introduced – a consideration of forms, in which the time functions appear and the terms appearing in the solution as a result. A fractional circuit example is presented in order to test the method. The computation time for the method is also studied.
Źródło:: Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 96; 231-242
1897-0737
Pojawia się w:: Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Dynamic stability of weak equations of rectangular plates
Dynamiczna stateczność słabych równań płyt prostokątnych
Autorzy:: Tylikowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/280859.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: dynamiczna stateczność
metoda Liapunowa
weak formulation
dynamic stability
different boundary conditions
Liapunov method
Opis:: The stability analysis method is developed for distributed dynamic problems with relaxed ssumptions imposed on solutions. The problem is motivated by structural vibrations with external time-dependent parametric excitations which are controlled using surfacemounted or embedded actuators and sensors. The strong form of equations involves irregulari- ties which lead to computational difficulties for estimation and control problems. In order to avoid irregular terms resulting from differentiation of force and moment terms, dynamical equations are written in a weak form. The weak form of dynamical equations of linear mechanical struc- tures is obtained using Hamilton’s principle. The study of stability of a stochastic weak system is based on examining properties of the Liapunov functional along a weak solution. Solving the problem is not dependent on assumed boundary conditions.
W pracy rozszerzono możliwości analizy stabilności układów ciągłych na układy z osłabionymi warunkami nakładanymi na rozwiązania. Układy aktywnego tłumienia drgań cienkościennych elementów płytowych mogą zawierać elementy piezoelektryczne oddziaływujące na konstrukcję.W uproszczonym modelu oddziaływanie to sprowadza się do działania momentów gnących lub sił rozłożonych na krawędziach elementu piezoelektrycznego. Wprowadzenie dystrybucji -Diraca i jej pochodnej prowadzi do analitycznego zapisu obciążenia i wprowadza nieregularności do rozwiązania zadania drgań wymuszonych układu ciągłego. Słabą postać równań płyty otrzymano za pomocą zasady Hamiltona. Badanie stateczności stochastycznych układów w formie słabej jest oparte na analizie funkcjonału Lapunowa wzdłuż słabego rozwiązania. Rozwiązanie zadania jest niezależne od przyjętych warunków brzegowych.
Źródło:: Journal of Theoretical and Applied Mechanics; 2008, 46, 3; 679-692
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of different tillage methods on the nutritional status, yield and quality of sugar beets
Autorzy:: Gaj, R.
Budka, A.
Niewiadomska, A.
Przybyl, J.
Mioduszewska, N.
Powiązania:: https://bibliotekanauki.pl/articles/13890.pdf
Data publikacji:: 2015
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:: different method
tillage method
mineral fertilization
sugar-beet
nutritional status
yield
quality
Opis:: Optimal nutrition of sugar beets at critical growth stages is one of the crucial factors for the achievement of their highest yield potential. In the present study, it was presumed that reduced systems of sugar beet cultivation had no effect on the plants’ nutritional status at critical growth stages, on their yield or technological quality. In 2012-2013, two series of one-factorial field experiments with different beet crop husbandry were carried out in order to verify this hypothesis. The cultivation systems of sugar beet crops differed in the postharvest cultivation technology, mulch types and seedbed tillage. Conservation tillage systems were compared with the control treatment, which represented the conventional cultivation system with an application of manure and 35 cm deep autumn ploughing. The plant nutritional status assessment was carried out at two dates corresponding to the following growth stages: BBCH 16/17 (6-8 fully unfolded true leaves) and BBCH 39/40 (row closing). Regardless of the methods of tillage or the year of observation, the results showed that the plants at BBCH16/17 stage were well-nourished with macroelements but malnourished with microelements, mainly iron and zinc. The microelement deficiency in the plants was a result of adjusted soil reaction, which varied from slightly acidic to neutral. At the BBCH 39/40 stage, there was a decreasing trend in the content of leaf macronutrients in the no-tillage systems treatments compared to the conventional tillage with the ploughing depth to 35 cm and manure application. The reduced tillage systems in sugar beet cultivation did not result in either a yield decrease or a worse technological quality of roots. The experimental factor had no significant effect on the content of molassegenic compounds in beet roots. A decreasing trend was observed in the content of α-amino nitrogen and potassium when compared to the traditional cultivation system. The study showed that the choice of a cultivation technology is of secondary importance as long as the plant grows in optimal conditions resulting from an appropriate site selection.
Źródło:: Journal of Elementology; 2015, 20, 3
1644-2296
Pojawia się w:: Journal of Elementology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Pollen viability and in vitro germination of selected Central European species from genus Rosa analysed with different methods
Autorzy:: Wronska-Pilarek, D.
Tomlik-Wyremblewska, A.
Powiązania:: https://bibliotekanauki.pl/articles/41113.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: pollen viability
in vitro germination
germination
Rosaceae
European species
Rosa
analysis method
different method
Opis:: The main aim of the study was to determine which of the viability and germination capacity of pollen grains estimation methods are optimal and to test if the studied sections and species within the Rosa genus are differentiated in pollen viability andgermination capacity. We analysedandcomparedpollen grains of 14 wild Rosa species using 5 viability tests and13 various liquidandagar media. Viability of pollen grains in the majority of the examinedspecies was greater than their germination capacity. The most viable pollen grains were foundin R. gallica (section Gallicanae), where average of 5 viability tests is 90.69%, andin R. pendulina (section Rosa) – 86.85%. Species from section Caninae have a lower level of viability (from 60.59% in R. rubiginosa to 31.23% in R. inodora). Pollen of species from sections Gallicanae (R. gallica; to 63.4%) and Rosa (R. pendulina; to 47.21%) germinatedmuch better than the pollen of the majority of species from section Caninae (with the exception of R. zalana; to 47.22%). The examinedpollen grains germinatedmost numerously on agar medium with 1.5% agar+15% sucrose+50 ppm boric acidandliquidmed ium with 15% sucrose+ 50 ppm boric acid. Following deep-freeze storage (–25°C) for six months, the pollen grains of nine selected species (with the exception of R. rubiginosa) showed viability higher or similar to that before storage.
Źródło:: Dendrobiology; 2010, 64
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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