Autor: Ding, D. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: An unconditionally positive and global stability preserving NSFD scheme for an epidemic model with vaccination
Autorzy:: Ding, D.
Ma, Q.
Ding, X.
Powiązania:: https://bibliotekanauki.pl/articles/330497.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: nonstandard finite difference
unconditional positivity
stability
Lyapunov function
metoda różnic skończonych
stabilność
funkcja Lyapunova
Opis:: In this paper, a NonStandard Finite Difference (NSFD) scheme is constructed, which can be used to determine numerical solutions for an epidemic model with vaccination. Here the NSFD method is employed to derive a set of difference equations for the epidemic model with vaccination. We show that difference equations have the same dynamics as the original differential system, such as the positivity of the solutions and the stability of the equilibria, without being restricted by the time step. Our proof of global stability utilizes the method of Lyapunov functions. Numerical simulation illustrates the effectiveness of our results.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 635-646
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical Simulations of Heat and Moisture Transport in Thermal Protective Clothing Under Flash Fire Conditions
Autorzy:: Song, G.
Chitrphiromsri, P.
Ding, D.
Powiązania:: https://bibliotekanauki.pl/articles/90206.pdf
Data publikacji:: 2008
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: numerical model
protective clothing
moisture transport
flash fire condition
skin model
Opis:: A numerical model of heat and moisture transport in thermal protective clothing during exposure to a flash fire was introduced. The model was developed with the assumption that textiles are treated as porous media. The numerical model predictions were compared with experimental data from different fabric systems and configurations. Additionally, with the introduction of a skin model, the parameters that affect the performance of thermal protective clothing were investigated.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2008, 14, 1; 89-106
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Preparation of CaCO3-SiO2 composite with core-shell structure and its application in silicone rubber
Autorzy:: Cui, Ch.
Ding, H.
Cao, L.
Chen, D.
Powiązania:: https://bibliotekanauki.pl/articles/778525.pdf
Data publikacji:: 2015
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: calcium carbonate
silica
silicone rubber
mechnao-chemistry
Opis:: A new CaCO_{3_{-SiO_{2_{composite with core-shell structure was successfully prepared by mechano-chemistry method (MCM). SEM and FTIR indicated that SiO_{2_{particles were homogeneously immobilized on the surface of CaCO_{3_{. The well dispersion of this CaCO_{3_{-SiO_{2_{composite into silicone rubber can not only reduce the usage amount of SiO_{2_{, but also improve the mechanical properties of silicone rubber. By the calculation, the theoretical numbers of the SiO2 particles is about 10 times as large as that of CaCO_{3_{particles in the CaCO_{3_{-SiO_{2_{composite. Mixing CaCO_{3_{-SiO_{2_{composite in silicone rubber can enhance the breaking strength of the silicone rubber about 18% as high as that when mixing the pure SiO_{2_{. And the elongation at break is about 14% less than that of adding the pure SiO_{2_sample.}}}}}}}}}}}}}}}}}}}}}}}}}}}
Źródło:: Polish Journal of Chemical Technology; 2015, 17, 4; 128-133
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effects of ZnO, CuO, Au, and TiO2 nanoparticles on Daphnia magna and early life stages of zebrafish danio rerio
Autorzy:: Liu, J.
Fan, D.
Wang, L.
Shi, L.
Ding, J.
Chen, Y.
Shen, S.
Powiązania:: https://bibliotekanauki.pl/articles/207169.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: metal oxides
titanium dioxide
nanoparticles
toxicity
zinc oxide
Daphnia magna
nanocząsteczki
tlenki metali
dwutlenek tytanu
toksyczność
tlenek cynku
rozwielitki
Opis:: The effects of four different kinds of nanoparticles (NPs), namely, CuO, ZnO, TiO2, and Au, of the sizes ranging from <20 nm to 50 nm on Daphnia magna, early life stage of zebrafish, and various enzymes have been investigated. The experimental results showed that the NPs inhibited both the body length and hatching rate of zebrafish larvae; the small nanoparticles exhibited more toxicity. In a 21 day chronic toxicity test, metal ions of higher concentrations significantly reduced the number of Daphnia magna offspring. Studies on enzyme activity showed that the NPs reduced the glutathione content and inhibited catalase and superoxide dismutase activities, resulting in shorter body length, lower hatching success, and lower reproduction of zebrafish larvae. Therefore, studies should focus more on the potential toxicity of smaller NPs.
Źródło:: Environment Protection Engineering; 2014, 40, 1; 139-149
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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