Sample records for vanadiya galliya titana

  1. Kontrola strukturnih i mikrostrukturnih karakteristika binarnih i ternarnih oksida titana za primenu u obnovljivim izvorima energije


    Veljković, Ivana


    U disertaciji je dat pregled binarnih i ternarnih oksidi titana, počev od fundamen-talnih principa, preko sinteze, karakterizacije i procesiranja, do konkretne primene. Osnovni cilj istraživanja bilo je uspostavljanje zavisnosti između sinteze, svojstava i primene nestehiometrijskih binarnih oksida: titan-monoksida (TiOx) i Manjelijevih faza (TinO2n-1), kao i ternarnih oksida: Li4Ti5O12 spinela i α-Li2-xTiO3-x (OH)x · yH2O koji sadrže litijum. Dobijeni materijali su ispitivani za primenu kao ...

  2. Korelacija između sadržaja titana u čeliku i elektromagnetskih svojstava neorijentiranih elektrolimova


    Steiner Petrovič, D.; Jenko, M.; Jaklič, A.; Čop, A.


    In this study the correlation between the titanium content of steel and the core loss of non-oriented electrical steel sheets was determined. The core loss and titanium content of steel have a weak, but positive, correlation. The core loss was found to increase with an increasing titanium content. The study included a statistical analysis of an industrial data set and a metallographic analysis of the titanium inclusions. The analyzed titanium inclusions in the electrical steel sheets containi...

  3. Pasivnost nekih zubnih materijala u Ringerovoj otopini


    Begić, Anita; Malina, Jadranka; Matković, Prosper


    U ovome radu ispitana je korozijska otpornost dviju eksperimentalnih zubnih slitina, Co-Cr-Mo i Co-Cr-Ni, jedne komercijalne Co-Cr-Mo (Wironit®) slitine, titana i Ag-amalgama (Permite®) u Ringerovoj otopini. Na osnovi elektrokemijskih mjerenja određen je relevantni pokazatelj lokalne korozije - piting potencijal Epit, pri kojem nastaje proboj pasivnoga sloja i pojava lokalne korozije. Vrjednovanjem materijala prema piting potencijalu pokazalo se da je korozijski najstabilniji čist titan, slij...

  4. Changes of vitamin C content in celery and parsley herb after processing

    Directory of Open Access Journals (Sweden)

    Magdaléna Valšíková


    Full Text Available Humans and other primates have lost the ability to synthesize vitamin C and therefore the only source is diet. Vitamin C or ascorbic acid has labile nature, it is removed or destroyed in specific degree immediately after harvest, but storage and post - harvest processing also contribute to its degradation. The aim of work was to determine the vitamin C content in the herb of selected celery and parsley varieties in dependence on chosen postharvest processing and to compare it with fresh herb. There were chosen five bulb forms varieties of celery (Apium graveolens - Makara, Ilonaa, Hegy Köi, Talar and Diamant. In case of parsley (Petroselinum crispum there were evaluated one variety of curly parsley, one variety of herb parsley - Petra, and five varieties of root parsley - Lenka, Eagle, Ginate D´Italia, Titana and Arat. Every variety was harvested in three terms, followed by vitamin C content estimation in fresh herb, after drying and after freezing. The content of vitamin C was estimated by HPLC method by the help of liquid chromatograph with UV detector. There was found the significant difference in content of vitamin C in parsley as well as in celery when comparing the fresh herb with herbs after post - harvest processes - drying (by air circulation in laboratory hall and freezing. After processing of herbs in both observed species the vitamin C content decreased, in case of freezing it was about 65% (celery and 61% (parsley, after drying about 86% (celery and 82% (parsley in comparison with fresh herb. The effect of processing played more important role in influencing of vitamin C content than variety in case of both selected species. For using of celery and parsley not only as culinary herb, but as a notable source of ascorbic acid it is the most important fresh herb intake.  Normal 0 21 false false false EN-GB X-NONE X-NONE

  5. Low temperature grown ZnO@TiO{sub 2} core shell nanorod arrays for dye sensitized solar cell application

    Energy Technology Data Exchange (ETDEWEB)

    Goh, Gregory Kia Liang [Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), 3 Research Link, 117602 Singapore (Singapore); Le, Hong Quang, E-mail: [Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research), 3 Research Link, 117602 Singapore (Singapore); Huang, Tang Jiao; Hui, Benjamin Tan Tiong [Department of Materials Science and Engineering (DMSE), Faculty of Engineering National University of Singapore (NUS) BLK E3A, #04-10, 7 Engineering Drive 1, Singapore 117574 (Singapore)


    High aspect ratio ZnO nanorod arrays were synthesized on fluorine-doped tin oxide glasses via a low temperature solution method. By adjusting the growth condition and adding polyethylenimine, ZnO nanorod arrays with tunable length were successfully achieved. The ZnO@TiO{sub 2} core shells structures were realized by a fast growth method of immersion into a (NH{sub 4}){sub 2}·TiF{sub 6} solution. Transmission electron microscopy, X-ray Diffraction and energy dispersive X-ray measurements all confirmed the existence of a titania shell uniformly covering the ZnO nanorod's surface. Results of solar cell testing showed that addition of a TiO{sub 2} shell to the ZnO nanorod significantly increased short circuit current (from 4.2 to 5.2 mA/cm{sup 2}), open circuit voltage (from 0.6 V to 0.8 V) and fill factor (from 42.8% to 73.02%). The overall cell efficiency jumped from 1.1% for bare ZnO nanorod to 3.03% for a ZnO@TiO{sub 2} core shell structured solar cell with a 18–22 nm shell thickness, a nearly threefold increase. - Graphical abstract: The synthesis process of coating TiO{sub 2} shell onto ZnO nanorod core is shown schematically. A thin, uniform, and conformal shell had been grown on the surface of the ZnO core after immersing in the (NH{sub 4}){sub 2}·TiF{sub 6} solution for 5–15 min. - Highlights: • ZnO@TiO{sub 2} core shell nanorod has been grown on FTO substrate using low temperature solution method. • TEM, XRD, EDX results confirmed the existing of titana shell, uniformly covered rod's surface. • TiO{sub 2} shell suppressed recombination, demonstrated significant enhancement in cell's efficiency. • Core shell DSSC's efficiency achieved as high as 3.03%, 3 times higher than that of ZnO nanorods.