Zapisi o vremenu i klimi na Jadranu do sredine 19. stoljeća

The paper deals with weather and climate descriptions originating before the establishment of the meteorological station network. The oldest of them stem from as long ago as the second and the first century B.C. They may be found in local and foreign almanacs, reports, letters, newspapers and books. In the first part of the paper records of weather are ordered chronologically. These are casual notes, accounts of somehow peculiar weather events, and even regular, almost daily weather notes written through many years in the 18th century in Makarska. The second segment presents reports on common weather characteristics, i.e. climate attributes. These are mostly wind accounts, particularly of Bura (Bora), but there are also a few climatographies.Rad se odnosi na kvalitativne zapise nastale prije osnutka mreže meteoroloških postaja, od kojih najstariji potječu još iz drugog i prvog stoljeća prije Krista. Nalaze se u različitim domaćim i stranim ljetopisima, kronikama, izvještajima, pismima, knjigama i novinama. U prvom dijelu članka kronološki su poredani zapisi o vremenu. To su usputne bilješke, prikazi po nečemu osobitih meteoroloških događaja, a čak i dugogodišnje gotovo redovito praćenje vremena u Makarskoj u 18. stoljeću. U drugom dijelu prikazani su zapisi o općim značajkama vremena, tj. o obilježjima klime. To su većinom prikazi vjetrova, osobito bure, a ima i nekoliko klimatografija

Rough droplet model for spherical metal clusters

We study the thermally activated oscillations, or capillary waves, of a neutral metal cluster within the liquid drop model. These deformations correspond to a surface roughness which we characterize by a single parameter $\Delta$. We derive a simple analytic approximate expression determining $\Delta$ as a function of temperature and cluster size. We then estimate the induced effects on shell structure by means of a periodic orbit analysis and compare with recent data for shell energy of sodium clusters in the size range $50 < N < 250$. A small surface roughness $\Delta\simeq 0.6$ \AA~ is seen to give a reasonable account of the decrease of amplitude of the shell structure observed in experiment. Moreover -- contrary to usual Jahn-Teller type of deformations -- roughness correctly reproduces the shape of the shell energy in the domain of sizes considered in experiment.Comment: 20 pages, 4 figures, important modifications of the presentation, to appear in Phys. Rev.

Barrier for the reaction X20+ + X20+ -> X402+ in alkali-metal clusters related to electron density at the bond midpoint of the supermolecule (X20+)2

Using the extended Thomas-Fermi version of density-functional theory (DFT), calculations are presented for the barrier for the reaction Na20++Na20+¿Na402+. The deviation from the simple Coulomb barrier is shown to be proportional to the electron density at the bond midpoint of the supermolecule (Na20+)2. An extension of conventional quantum-chemical studies of homonuclear diatomic molecular ions is then effected to apply to the supermolecular ions of the alkali metals. This then allows the Na results to be utilized to make semiquantitative predictions of position and height of the maximum of the fusion barrier for other alkali clusters. These predictions are confirmed by means of similar DFT calculations for the K clusters