Grain-boundary topological superconductor

We show that a grain boundary (GB) defect, constituted by a one-dimensional dislocation superlattice, can host a topological superconductor (SC) with a pair of co-habitating Majorana zero modes (MZMs) at its end when immersed in a parent two-dimensional topological SC. For the realization of our proposal, it is essential that the single-dislocation defects feature MZMs, implying that the parent topological SC should be gapped with the Fermi surface away from the $\Gamma-$point. As we demonstrate, both numerically and analytically, the GB topological SC with two localized MZMs then emerge in a finite range of both the angle and the magnitude of the applied exchange magnetic field. Finally, we argue that the proposed GB SC can be realized in various superconducting materials where the GB defects can be readily manipulated.Comment: 6 pages, 4 figure

An Optimization of Command History Search

A command that a user issues at the comm and prompt is a string encoded with certain character encoding. This charact er string can be stored into an appro- priate data structure in order to be documented or reused. Additional function- ality of the command line to store entered commands, along with ability to list, edit and re-execute previously entered commands, is called command history. The paper suggests an optimization of command history search based on pro- posed grammar of the command language

Emergent metallicity at the grain boundaries of higher-order topological insulators

Topological lattice defects, such as dislocations and grain boundaries (GBs), are ubiquitously present in the bulk of quantum materials and externally tunable in metamaterials. In terms of robust modes, localized near the defect cores, they are instrumental in identifying topological crystals, featuring the hallmark band inversion at a finite momentum (translationally active type). Here we show that GB superlattices in both two- and three-dimensional translationally active higher-order topological insulators harbor a myriad of dispersive modes that are typically placed at finite energies, but always well-separated from the bulk states. However, when the Burgers vector of the constituting edge dislocations points toward the gapless corners or hinges, both second- and third-order topological insulators accommodate self-organized emergent topological metals in the GB mini Brillouin zone. We discuss possible material platforms where our proposed scenarios can be realized through band-structure and defect engineering.Comment: 6 Pages, 4 Figure

Utjecaj onečišćenosti zraka na pH-vrijednosti kore drveća na području Zagreba i Siska

The bark pH-values of deciduous trees were measured on the localities with different degrees of air pollution, i.e. S02 immission, in the regions of Zagreb and Sisak. In both cities Quercus robur and Tilia cordata were investigated, while Acer platanoides and A. pseudoplatanus were examined in Zagreb and Tilia tomentosa, Betula pendula and Populus italica only in Sisak. Lower bark pH-values were measured on the localities with greater air pollution, i.e. SO2 immission, and higher values were shown by specimens of the same species growing on comparatively less polluted localities. These data are in accordance with those obtained in some other areas of Europe (Sweden, Poland, FR Germany), confirming that bark pH-values could be used as indicators of SO2 immission.Istraživane su pH-vrijednosti kore drveća na području Zagreba i Siska na nekoliko lokaliteta koji se razlikuju s obzirom na onečišćenost zraka odnosno imisiju S02. U pokus je uzeto 7 vrsta drveća od kojih su Quercus robur i Tilia cordata istraživane u Zagrebu i Sisku, Acer platanoides i A. pseudoplatanus samo na području Zagreba, a Tilia tomentosa, Betula pendula i Populus italica samo na području Siska. Skupljanje i pripremanje uzoraka kore te određivanje pH-vrijednosti vršeno je po metodi kako su je opisali Lotschert i Kbhm (1973) s manjim modifikacijama (v. engleski tekst). Doneseni su i raspoloživi podaci o imisiji S02 na dva lokaliteta u Sisku (tab. 1) i na tri lokaliteta u Zagrebu (tab. 2, si. 1). U svih istraživanih vrsta kora je pokazivala kiselu reakciju, a prosječne vrijednosti izmjerene su u rasponu između pH 3,37, koliko je najniže pokazivala kora hrasta lužnjaka (Quercus robur) u središtu Zagreba i pH 6,17 u jablana (Populus italica) u okolici Siska u Starom Brodu (tab. 3 i 4, si. 2). I u Zagrebu i u Sisku u svake istraživane vrste najniže pH-vrijednosti (tj. najkiselija reakcija) izmjerene su na lokalitetima s većom imi- sijom S02, dok su najviše vrijednosti bile izmjerene na komparativnim (»čistim«) područjima izvan grada. U tom su smislu naši rezultati analogni onima iz nekih drugih područja Evrope (Švedska, Poljska, SR Njemačka) gdje je utvrđena ista pravilnost (tab. 5 i 6), pa se može zaključiti da pH-vrijednosti kore drveća mogu poslužiti kao indikator imisije SOs. Usporedba rezultata dobivenih na području Zagreba i Siska s onima iz Stockholma, Frankfurta i Krakowa, s obzirom na pH-vrijednosti kore istovrsnog drveća, pokazuje da je imisija S02 (u razdoblju na koje se odnose rezultati istraživanja u svakom od navedenih gradova) bila veća u Stockholmu i Frankfurtu nego u Zagrebu i (osobito) u Sisku i okolici. Rezultati za središte Zagreba i Krakowa pokazuju veliku podudarnost

Analiza odnos između ishoda učenja studijskih programa i predmeta

This paper analyzes the learning outcomes of study programs and courses at the Faculty of Humanities and Social Sciences, University of Zagreb, and associates them with levels of Bloom\u27s taxonomy in order to determine their relationships. The analysis showed statistically significant differences in the levels of learning outcomes between studies and their courses. The outcomes of study programs place more emphasis on higher levels of cognitive, affective and psychomotor domains. It was determined that there is a slight difference between the courses at the undergraduate and graduate levels of study, which is in accordance with expectations as the learning outcomes at the undergraduate level include lower levels of cognitive and affective domains. The analysis of compulsory and elective courses showed that elective courses place more emphasis on the cognitive domain, whereas compulsory courses place more emphasis on the affective domain.U radu se analiziraju ishodi učenja studijskih programa i predmeta na Filozofskom fakultetu Sveučilišta u Zagrebu te povezuju s razinama Bloomove taksonomije, kako bi se utvrdili njihovi međusobni odnosi. Analiza je pokazala da postoji statistički značajna razlika u razinama ishoda učenja između studija i predmeta koji se na njima izvode. Kod ishoda studija izraženije su više razine kognitivne, afektivne i psihomotoričke domene. Također je utvrđena razlika između predmeta na preddiplomskoj i diplomskoj razini studija, koja je u skladu s očekivanjima jer ishodi učenja na preddiplomskoj razini studija imaju niže razine kognitivne i afektivne domene. Analiza obaveznih i izbornih predmeta pokazala je da je kod izbornih predmeta izraženija kognitivna domena, a da je kod obaveznih predmeta izraženija afektivna domena