Exchange Rate and Trade Balance: J-curve Effect

This paper shows that exchange rate depreciation in Serbia improves trade balance in the long run, while giving rise to a J-curve effect in the short run. These results add to the already existent empirical evidence for a diverse set of other economies. Both Johansen’s and autoregressive distributed lag approach are respectively used giving similar long-run estimates showing that real depreciation improves trade balance. Corresponding errorcorrection models as well as impulse response functions indicate that, following currency depreciation, trade balance first deteriorates before it later improves, i.e. exhibiting the J-curve pattern. These results are relevant for policy making both in Serbia and in a number of other emerging Europe countries as they face major current account adjustments after BoP crises of 2009.Exchange rate and trade balance, J-curve, Cointegration, Autoregressive distributed lag approach.

Make Slow Fast -- how to speed up interacting disordered matter

Anderson and dynamical localization have been experimentally observed with ultra-cold atomic matter. Feshbach resonances are used to efficiently control the strength of interactions between atoms. This allows to study the delocalization effect of interactions for localized wave packets. The delocalization processes are subdiffusive and slow, thereby limiting the quantitative experimental and numerical analysis. We propose an elegant solution of the problem by proper ramping the interaction strength in time. We demonstrate that subdiffusion is speeded up to normal diffusion for interacting disordered and kicked atomic systems. The door is open to test these theoretical results experimentally, and to attack similar computational quests in higher space dimension

How Constraints Affect Content: The Case of Twitter's Switch from 140 to 280 Characters

It is often said that constraints affect creative production, both in terms of form and quality. Online social media platforms frequently impose constraints on the content that users can produce, limiting the range of possible contributions. Do these restrictions tend to push creators towards producing more or less successful content? How do creators adapt their contributions to fit the limits imposed by social media platforms? To answer these questions, we conduct an observational study of a recent event: on November 7, 2017, Twitter changed the maximum allowable length of a tweet from 140 to 280 characters, thereby significantly altering its signature constraint. In the first study of this switch, we compare tweets with nearly or exactly 140 characters before the change to tweets of the same length posted after the change. This setup enables us to characterize how users alter their tweets to fit the constraint and how this affects their tweets' success. We find that in response to a length constraint, users write more tersely, use more abbreviations and contracted forms, and use fewer definite articles. Also, although in general tweet success increases with length, we find initial evidence that tweets made to fit the 140-character constraint tend to be more successful than similar-length tweets written when the constraint was removed, suggesting that the length constraint improved tweet quality.Comment: To appear in the Proceedings of AAAI ICWSM 201

Localized modes in mini-gaps opened by periodically modulated intersite coupling in two-dimensional nonlinear lattices

Spatially periodic modulation of the intersite coupling in two-dimensional (2D) nonlinear lattices modifies the eigenvalue spectrum by opening mini-gaps in it. This work aims to build stable localized modes in the new bandgaps. Numerical analysis shows that single-peak and composite two- and four-peak discrete static solitons and breathers emerge as such modes in certain parameter areas inside the mini-gaps of the 2D superlattice induced by the periodic modulation of the intersite coupling along both directions.The single-peak solitons and four-peak discrete solitons are stable in a part of their existence domain, while unstable stationary states (in particular, two-soliton complexes) may readily transform into robust localized breathers.Comment: Chaos, in pres

Nonlinear symmetry breaking of Aharonov-Bohm cages

We study the influence of mean field cubic nonlinearity on Aharonov-Bohm caging in a diamond lattice with synthetic magnetic flux. For sufficiently weak nonlinearities the Aharonov-Bohm caging persists as periodic nonlinear breathing dynamics. Above a critical nonlinearity, symmetry breaking induces a sharp transition in the dynamics and enables stronger wavepacket spreading. This transition is distinct from other flatband networks, where continuous spreading is induced by effective nonlinear hopping or resonances with delocalized modes, and is in contrast to the quantum limit, where two-particle hopping enables arbitrarily large spreading. This nonlinear symmetry breaking transition is readily observable in femtosecond laser-written waveguide arrays.Comment: 6 pages, 5 figure

O narodnoj medicini Brodskoga Posavlja

The final contribution to (folk) medicine (i.e. its history), ethnology, cultural anthropology, and dialectology is presented in the Lexicon of Slavonian Folk Medicine of Brodsko Posavlje published in Osijek, 2017, by the Josip Juraj Strossmayer University in Osijek and the Faculty of Education. The Lexicon was co-authored by a group of researchers: Emina Berbić Kolar, Tanja Đurić, Monika Grozdanović, Josip Jagodar, Antun Javor, Ivana Mihić and Katarina Sudarević. Co-authors went to 14 places in Brodsko Posavlje (Bebrina, Brodski Stupnik, Davor, Donji Lipovac, Dubočac, Gornji Lipovac, Kaniža, Lužani, Magić Mala, Siče, Slavonski Kobaš, Srednji Lipovac and Velika Kopanica) to find speakers, around 60 of them, and used their utterances as the database for the lexicon.Posljednji doprinos (narodnoj) medicini (tj. njezinoj povijesti), etnologiji, kulturnoj antropologiji i dijalektologiji predstavlja Leksikon slavonske narodne medicine Brodskoga Posavlja objavljen 2017. u Osijeku u nakladi Sveučilišta Josipa Jurja Strossmayera u Osijeku i Fakulteta za odgojne i obrazovne znanosti. Leksikon je nastao u suautorstvu skupine istraživača: Emine Berbić Kolar, Tanje Đurić, Monike Grozdanović, Josipa Jagodara, Antuna Javora, Ivane Mihić i Katarine Sudarević. Suautori su obišli četrnaest mjesta Brodskoga Posavlja (Bebrinu, Brodski Stupnik, Davor, Donji Lipovac, Dubočac, Gornji Lipovac, Kanižu, Lužane, Magić Malu, Siče, Slavonski Kobaš, Srednji Lipovac i Veliku Kopanicu) pronalazeći kazivače, njih šezdesetak, čija su im kazivanja poslužila leksikonska građa

Soliton stability and collapse in the discrete nonpolynomial Schrodinger equation with dipole-dipole interactions

The stability and collapse of fundamental unstaggered bright solitons in the discrete Schrodinger equation with the nonpolynomial on-site nonlinearity, which models a nearly one-dimensional Bose-Einstein condensate trapped in a deep optical lattice, are studied in the presence of the long-range dipole-dipole (DD) interactions. The cases of both attractive and repulsive contact and DD interaction are considered. The results are summarized in the form of stability/collapse diagrams in the parametric space of the model, which demonstrate that the the attractive DD interactions stabilize the solitons and help to prevent the collapse. Mobility of the discrete solitons is briefly considered too.Comment: 6 figure

Sintaktička negacija u hrvatskome i makedonskome jeziku

Syntactic negation: a comparative analysis of syntactic negation in Croatian and Macedonian is a scientific monograph by Iva Nazalević Čučević published by Hrvatska sveučilišna naklada in Zagreb, 2016. It is an extremely valuable monograph which has a context of applied linguistics, along with its more narrow linguistic contribution. This primarily concerns glottodidactics and translation.Sintaktička negacija: usporedna analiza sintaktičke negacije u hrvatskome i makedonskome jeziku znanstvena je monografija Ive Nazalević Čučević koju Hrvatska sveučilišna naklada objavljuje 2016. u Zagrebu. Riječ je o iznimno vrijednoj monografiji koja uza svoj velik uže lingvistički doprinos svakako svoju vrijednost ima i u kontekstu primijenjene lingvistike, pričem se prvenstveno misli na glotodidaktiku i prevođenje

Nonlinear localized flatband modes with spin-orbit coupling

We report the coexistence and properties of stable compact localized states (CLSs) and discrete solitons (DSs) for nonlinear spinor waves on a flatband network with spin-orbit coupling (SOC). The system can be implemented by means of a binary Bose-Einstein condensate loaded in the corresponding optical lattice. In the linear limit, the SOC opens a minigap between flat and dispersive bands in the system's bandgap structure, and preserves the existence of CLSs at the flatband frequency, simultaneously lowering their symmetry. Adding onsite cubic nonlinearity, the CLSs persist and remain available in an exact analytical form, with frequencies which are smoothly tuned into the minigap. Inside of the minigap, the CLS and DS families are stable in narrow areas adjacent to the FB. Deep inside the semi-infinite gap, both the CLSs and DSs are stable too.Comment: 10 figures, Physical Review B, in pres