Autor: Mesfin, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Chemical Composition of Yushania alpina (K. Schum.) W.C.Lin (1974) (Highland Bamboo) Grown in Ethiopia
Autorzy:: Tsegaye, Mahelete
Chandravanshi, B. S.
Feleke, Sisay
Redi, Mesfin
Powiązania:: https://bibliotekanauki.pl/articles/1031511.pdf
Data publikacji:: 2020
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Cellulose
Chemical composition
Hemicellulose
Lignin
Yushania alpina
Opis:: Chemical properties of any lignocellulose species are one of the major properties that used to select the material for any purpose either chemical or biological. Since bamboo is one of the woody grass species used for various applications worldwide; therefore knowing the chemical composition plays greater a role. Based on the above assumption, this research was conducted to study the major chemical composition of Yushania alpina (K. Schum.) W.C.Lin (1974) (Highland Bamboo) grown around Enjibara in Ethiopia. In the work, Yushania alpina (Highland Bamboo) sample was harvested, dried, milled using a Wiley Mill, sieved and all chemical composition were determined based on the National Renewable Energy Laboratory (ASTM) approaches, except that the Kurschner-Hoffer method (1931) was applied for cellulose determination. Based on the study, the chemical composition characterization shows that Yushania alpina has 46.76% cellulose content, 25.27% lignin content, 12.18% hemicellulose, 3.77% ash, 12.23% hot-water extractive and 3.93% ethanol-toluene extractives.
Źródło:: World News of Natural Sciences; 2020, 32; 1-9
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of retrapping on thermoluminescence peak intensities of small amorphous silicon quantum dots
Autorzy:: Debelo, N.
Dejene, F.
Mal'nev, V.
Senbeta, T.
Mesfin, B.
Roro, K.
Powiązania:: https://bibliotekanauki.pl/articles/1070477.pdf
Data publikacji:: 2016-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.21.La
73.63.Kv
Opis:: The effect of retrapping on thermoluminescence intensity peak corresponding to each trap of small amorphous silicon quantum dots in three traps - one recombination center model is investigated. For first order kinetics, where there is no effect of retrapping, the thermoluminescence intensity clearly depends on the level of the trap beneath the edge of the conduction band. This energy difference between the edge of the conduction band and the level of the trap is called trap depth (activation energy). The shallowest trap gives the highest thermoluminescence intensity peak for first order kinetics. However, it was clearly observed that for second order and a case beyond second order kinetics, the thermoluminescence intensity peak corresponding to each trap does not depend on the trap depth. In this case, the retrapping probability coefficients are taken into account and most electrons which are detrapped from the shallow trap(s) will be retrapped to the deeper trap(s) resulting in fewer electrons taking part in the recombination process. This significantly reduces the thermoluminescence intensity peaks of the shallower trap(s). It was observed that the deepest trap, with very high concentration of electrons due to the retrapping phenomenon, gives the highest thermoluminescence intensity. In addition, the variation of concentration of electrons in each trap and the intensity of the thermoluminescence are presented. Though we considered the model of three traps and one recombination center, this phenomenon is true for any multiple traps.
Źródło:: Acta Physica Polonica A; 2016, 129, 3; 362-366
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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