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4573. Metal oxide and metal carbides thin films for photo/electrochemical water splitting studiesSaim Emin, 2017, objavljeni povzetek znanstvenega prispevka na konferenci Opis: We used wet-chemistry techniques to prepare colloidal tungsten (W) nanoparticles (NPs). The synthesis of W NPs was conducted using the so called hot-matrix method in 1-octadecene [1]. The sizes of obtained W NPs are in the order of 2 - 5 nm. These W NPs are coated with hydrophobic molecules which allow their dispersion in organic solvents like choloroform (CHCl3). It was found that the colloidal stability of the dispersions is exceptionally high exceeding several years. The stability of W NPs which prevents coagulation allows the preparation of thin films with uniform thicknesses by spin-coating, inkjet-printing and spray coating.
We have prepared both tungsten trioxide (WO3) and tungsten carbide (W2C, WC) thin films. The preparation of WO3 thin films was achieved by spin-coating of W NPs on fluorine doped tin oxide (FTO) glass substrates and following thermal treatment in air at 500°C. The preparation of W2C and WC were done after spin-coating of W NPs on graphite substrate and following heat treatment under Ar atmosphere at 1000 and 1450°C.
The obtained WO3 and W2C (e.g WC) films were used both in photo/electrochemical water splitting studies. In conclusion, we have developed a procedure for the synthesis of W NPs which can be used for the preparation of different class of materials for water splitting studies.
Ključne besede: metal oxides, metal carbides, tungsten nanoparticles
Objavljeno v RUNG: 09.10.2017; Ogledov: 5306; Prenosov: 0
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4574. Tungsten carbide thin films for electrochemical water splitting studiesSaim Emin, Cesur Altinkaya, Ali Semerci, Matjaž Valant, Hasan Okuyucu, Abdullah Yildiz, 2017, objavljeni povzetek znanstvenega prispevka na konferenci Opis: We used wet-chemistry techniques to prepare colloidal tungsten (W) nanoparticles (NPs). The synthesis of W NPs was conducted using the so called hot-matrix method in 1-octadecene [1]. The sizes of obtained W NPs are in the order of 2 - 5 nm. These W NPs are coated with hydrophobic molecules which allow their dispersion in organic solvents like choloroform (CHCl3). It was found that the colloidal stability of the dispersions is exceptionally high exceeding several years. The stability of W NPs which prevents coagulation allows the preparation of thin films with uniform thicknesses by spin-coating, inkjet-printing and spray coating.
We have prepared tungsten carbide (W2C, WC) thin films. The preparation of W2C and WC was achieved by spin-coating of pre-synthesized W NPs on graphite substrate and following heat treatment under Ar atmosphere at 1000 and 1450°C.
The obtained W2C and WC films were used both in electrochemical water splitting studies. We also made a composite W2C-Pt films where we used only 5 at.% of Pt. The W2C-Pt composite has shown similar performance as pure Pt-C for hydrogen (H2) evolution. In conclusion, we have developed a procedure for the synthesis of W NPs which can be applied for the preparation of tungsten carbides films and their use for electrochemical water splitting.
Ključne besede: water splitting, nanoparticles, hot-matrix
Objavljeno v RUNG: 09.10.2017; Ogledov: 6028; Prenosov: 0
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4575. Pogovor s profesorji Fakultete za humanistiko Univerze v Novi Gorici: dr. Katjo Mihurko Poniž, dr. Heleno Dobrovoljc in dr. Zoranom Božičem : Teden Univerze v Novi Gorici 2017Zoran Božič, druga izvedena dela Opis: Pogovor, ki je potekal na Gimnaziji Nova Gorica in je bil namenjen dijakom te srednje šole, sta vodili študentki slovenistike in študent kulturne zgodovine na Fakulteti za humanistiko.
Ključne besede: UNG, Fakulteta za humanistiko, jezikoslovje, književnost, raziskovanje, srednja šola, Katja Mihurko Poniž, Helena Dobrovoljc, Zoran Božič, Maribor, Ljubljana, Kranj
Objavljeno v RUNG: 09.10.2017; Ogledov: 4402; Prenosov: 0
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4576. Obisk slovenske knjižnice Damirja Feigla in Trgovskega doma v GoriciAna Toroš, 2017, druga izvedena dela Opis: Strokovni ogled slovenske knjižnice Damirja Feigla, ki deluje v okviru Narodne in študijske knjižnice iz Trsta, seznanitev z zgodovino in delovanjem knjižnice. Strokovni ogled Trgovskega doma v Gorici.
http://www.ung.si/sl/raziskave/noc-raziskovalcev/obisk_knjiznice/
Ključne besede: slovenska manjšina, slovenska literatura, Gorica, Damir Feigel, Alojz Gradnik, France Bevk, Ljubka Šorli
Objavljeno v RUNG: 06.10.2017; Ogledov: 4200; Prenosov: 0
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4577. Science with the Cherenkov Telescope ArrayGašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Marko Zavrtanik, B.S. Acharya, Danilo Zavrtanik, 2017, znanstvena monografija Ključne besede: astronomija z gama žarki, ekstremna okolja v vesolju, izvori relativističnih kozmičnih žarkov, nevtronske zvezde, črne luknje, temna snov, gravitacija
Objavljeno v RUNG: 04.10.2017; Ogledov: 4969; Prenosov: 203
 Celotno besedilo (13,37 MB) |
4578. Prekletstvo večinskega volilnega sistemaZoran Božič, 2017, drugi sestavni deli Opis: Prispevek o neustavnosti sedanjega sorazmernega volilnega sistema za volitve poslancev v Državni zbor, o poskusih spremembe volilnega sistema, o značilnostih dvokrožnega večinskega volilnega sistema in o odlašanju Ustavnega sodišča glede presoje volilne zakonodaje.
Ključne besede: volilni sistem, sorazmerni volilni sistem, večinski volilni sistem, ustava, demokracija, referendum, Janez Drnovšek, ideološka polarizacija, volitve županov, volitve predsednika republike
Objavljeno v RUNG: 03.10.2017; Ogledov: 4213; Prenosov: 144
Celotno besedilo (328,17 KB) |
4579. O Tomažu, romanu, vojski in srečiZoran Božič, 2017, recenzija, prikaz knjige, kritika Opis: Recenzija knjige prinaša oceno romana Tomaža Kosmača Preko vode do svobode in utrinke iz služenja vojaškega roka avtorja recenzije.
Ključne besede: Preko vode do svobode, Tomaž Kosmač, roman, avtobiografija, Jugoslovanska ljudska armada, Kumbor, Črna gora, SFRJ, mornarica, Prevlaka, Hercegnovi, vezist, vojaški zapor, Kovačič, Resničnost, Beograd, Voždovac, ročni minometalec
Objavljeno v RUNG: 02.10.2017; Ogledov: 4215; Prenosov: 120
Celotno besedilo (2,94 MB) |
4580. Sets of Invariant Measures and Cesaro StabilitySergey Kryzhevich, 2017, izvirni znanstveni članek Opis: We take a space X of dynamical systems that could be: homeomorphisms or continuous maps of a compact metric space K or diffeomorphisms of a smooth manifold or actions of an amenable group. We demonstrate that a typical dynamical system of X is a continuity point for the set of probability invariant measures considered as a function of a map, let Y be the set of all such continuity points. As a corollary we prove that for typical dynamical systems average values of continuous functions calculated along trajectories do not drastically change if the system is perturbed.
Ključne besede: ergodic theory, invariant measures, shadowing, stability, tolerance stability, topological dynamics
Objavljeno v RUNG: 02.10.2017; Ogledov: 3684; Prenosov: 0
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