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Uni-Report aktuell. 6.2.1985
(1985)
Development of the flash-heating method for measuring melting temperatures in the diamond anvil cell
(2016)
A new ‘laser flash-heating’ method has been developed for measuring melting temperatures above 2000 K in a diamond anvil cell at gigapascals of pressure. It overcomes the general difficulties in detecting an onset of melting in a diamond anvil cell. It also circumvents the notorious experimental difficulties associated with the long heating durations of the CW laser-heating and the short timescales in the pulsed laser-heating and shock-compression experiments.
In this method, the duration of heating a sample is tuned to avoid chemical reactions of the sample with the diamond anvils and the surrounding pressure medium, while maintaining the accuracy of the temperature measurements. The absence of chemical reactions is confirmed by the EDS technique. Melt detection is now unambiguous from the analysis of textures on the surface and in depth of the recovered samples using the SEM and FIBM techniques, respectively. Using this method, the following has been achieved.
1. The melting curve of hcp-Re has been measured to 48 GPa, 4200 K for the first time. It has a significantly steeper slope than those observed for other transition metals like W and Mo with bcc structures. Above 20 GPa, Re becomes the most refractory metal surpassing W.
2. The melting curve of bcc-Mo has been measured to 45 GPa, 3100 K. It agrees with previous melt-slopes approaching zero value with pressure as reported in the LHDAC experiments using ADXRD and visual observation techniques for inferring the onset of melting. Flash-heating experiments at pressures higher than 50 GPa are required to further corroborate the flat melt-slope and resolve the long standing controversy about melting of Mo.
3. The melting curve of bcc-Ta has been measured to 85 GPa, 4300 K. Unlike in previous experiments using ADXRD and visual observation as probes, it has been tightly bracketed with an unambiguous detection of the onset of melting, without any chemical reaction. The present melting curve cannot be reconciled with shock measurements and theoretical predictions, and the precision of measurements calls for a reevaluation of theoretical, shock compression, and other DAC approaches to determine melting at high pressures. A further analysis with TEM technique for investigating the structure of the heated portion below and above melting temperatures of Ta may benefit in resolving various phase transitions predicted to explain the vast discrepancies in the reported melt-slopes.
When extrapolated to one atmosphere pressure, all the measured flashmelting curves agree with the known melting points.
The article gives an overview of the most important linguistic publications on the Burgenland Croatian dialects so far and concludes that our picture of these dialects is still far from complete. Two examples are given of unsolved questions that illustrate why a more complete picture than we have at the moment is necessary. The author wishes to point out that good quality linguistic fieldwork in this region deserves higher priority than it is given now, especially since the dialects are dying out so fast.
Vremenski instrumental
(2014)
U radu se analizira metoda opisa tvorbe pridjeva u Grammatik der illyrischen Sprache (Wien, 1854.) Andrije Torkvata Brlića i u Slovnici Hèrvatskoj za gimnazije i realne škole (Zagreb, 1859.) Antuna Mažuranića. Modeli se opisa tvorbe pridjeva propituju s obzirom na tvorbene načine te pripadajuće im sufikse i tvorbene preoblike. Dobiveni se rezultati analize uspoređuju sa suvremenim pristupima gramatičkim tvorbenim opisima pridjeva u hrvatskome jeziku.
Autor, motiviran ponajprije poznatom pretpostavkom o tome da je Marko Marulić možda studirao pravne znanosti, prvo daje pregled dosadašnjih ograničenih pokušaja da se govori o pravnoj terminologiji u Marulićevu opusu na hrvatskom jeziku. Poslije se, s obzirom na to da se u prikazanoj literaturi katkada implicira (ali i eksplicira) da se Marulić koristi tim terminima zato što je bio pravnik, pretragom spomenutog opusa u potrazi za potencijalnim pravnim terminima pokušava utvrditi može li se takvo razmišljanje bolje potkrijepiti ili pak opovrgnuti. Na kraju se raspravlja o metodološkim problemima, ograničenjima, ali i mogućnostima poboljšanja takvih filoloških istraživanja.