Variation of fluxes of RR Tel emission lines measured in 2000 with respect to 1996

The aim of this work is to make available unpublished non-Fe+ emission line fluxes from optical spectra of the symbiotic nova RR Tel which were taken in 2000, and to compare them with fluxes of the same lines from spectra taken in 1996. After leaving out blends and misidentifications, as well as the unreliable far-red and violet lines, we present the log (F2000/F1996) flux ratios for identified non-Fe+ lines. Mean values of log (F2000/F1996) for different ionization potential ranges of the ions producing the lines are shown separately for the permitted and forbidden lines. All means show fading, which is larger in the lowest range of ionization potential. Provisional interpretations are suggested. We also measured the values of FWHM in 2000; the previously known decrease with time of FWHM of lines due to the same ion has continued.Comment: 16 pages, 5 figure

The Commercial ‘All That We Share’: A Contemporary Reality Television Myth

The aim of the paper is a semiotic analysis of the commercial All That We Share by TV 2 Denmark A/S within the contemporary theoretical framework of Barthes, Fiske, Hartley, Silverstone and Solar. The paper briefly outlines the theories these authors developed regarding myth as discourse, the mythical and bardic role of television, television as a transitional object that participates in the establishment of ontological security and myth as an expression of mythical consciousness that still coexists with other forms of consciousness. The text of All That We Share is viewed in relation to the goal of creating and achieving results, by analysing the affiliation of media and genre and by a semiotic analysis of its structural components, as well as the expressive means used. The paper attempts to prove that the text is a contemporary reality TV myth that uses digital distribution models and the moment of emergence of curatorial culture in which, apart from losing the clean boundaries between genres and the media, the viewers take on the role of distributors and co-creators of the narrative. The text does not only stay within the code of the television and the mythical code but it also presents these codes in their direct, simple and clear form. This form of storytelling, harmonised with the precise selection of the initial moment of text distribution that strongly contextualises it, contributes to the creation of its meaning, enhances its distribution and ensures the global success of the text

Zašto baš binge-watching? Istaknuti motivi i analiza motivirajućih hedonističkih i eudamonijskih elemenata emocionalnog zadovoljenja u iskustvu binge-watchinga

Binge-watching is a popular form of media consumption, and entertainment is one of the main drivers of this activity. This research aims to examine the prominent reasons for binge-watching by re-examining the established television viewing motives, by deepening the analysis of entertainment motives, and by introducing a new possible motive – the need for narrative understanding. Therefore, the researcher combines the factors of the established television viewing motives, the factors of hedonic and eudaimonic emotional gratification in an entertainment experience and introduces the motive of the ease of following storylines. The results of an online survey with 833 participants over the age of eighteen conducted in Croatia suggest that the motives of relaxation, fun (hedonic), habit, easier following of intricate storylines, escape, and thrill (hedonic) are prominent. Eudaimonic motives are less pronounced than hedonic ones, however, these clusters are positively related, which indicates the complexity of enjoyment in binge-watching entertainment.Binge-watching je popularan oblik medijske konzumacije, a zabava je jedan od izraženih pokretača te aktivnosti. Cilj je istraživanja predočenog u članku istražiti razloge binge-watchinga preispitivanjem etabliranih motiva gledanja televizije, produbljivanjem istraživanja motiva zabave te uvođenjem novoga mogućeg motiva: potrebe za narativnim razumijevanjem. Stoga istraživanje kombinira čimbenike već prije utvrđenih motiva gledanja televizije i čimbenike emocionalnog zadovoljenja hedonističkim i eudamonijskim elementima zabave te uvodi motiv lakšeg praćenja zamršenih linija priče. Rezultati internetskog istraživanja provedenog u Hrvatskoj na 833 sudionika starija od 18 godina pokazuju da su istaknuti motivi binge-watchinga: opuštanje, dobar provod (hedonistički), navika, laganije praćenje zapetljanih linija priče, bijeg i uzbuđenje (hedonistički). Eudamonijski motivi su slabije izraženi od hedonističkih, ali te su skupine motiva u pozitivnoj korelaciji, što upućuje na složenost uživanja u zabavi binge-watchinga

Polarization measurements and their perspectives: PVLAS Phase II

We sketch the proposal for a "PVLAS-Phase II" experiment. The main physics goal is to achieve the first direct observation of non-linear effects in electromagnetism predicted by QED and the measurement of the photon-photon scattering cross section at low energies (1-2 eV). Physical processes such as ALP and MCP production in a magnetic field could also be accessible if sensitive enough operation is reached. The short term experimental strategy is to compact as much as possible the dimensions of the apparatus in order to bring noise sources under control and to attain a sufficient sensitivity. We will also briefly mention future pespectives, such as a scheme to implement the resonant regeneration principle for the detection of ALPs.Comment: Paper submitted to the proceedings of the "4th Patras Workshop on Axions, WIMPs and WISPs", DESY, Hamburg Site /Germany, 18-21 June 200

The Commercial ‘All That We Share’: A Contemporary Reality Television Myth

The aim of the paper is a semiotic analysis of the commercial All That We Share by TV 2 Denmark A/S within the contemporary theoretical framework of Barthes, Fiske, Hartley, Silverstone and Solar. The paper briefly outlines the theories these authors developed regarding myth as discourse, the mythical and bardic role of television, television as a transitional object that participates in the establishment of ontological security and myth as an expression of mythical consciousness that still coexists with other forms of consciousness. The text of All That We Share is viewed in relation to the goal of creating and achieving results, by analysing the affiliation of media and genre and by a semiotic analysis of its structural components, as well as the expressive means used. The paper attempts to prove that the text is a contemporary reality TV myth that uses digital distribution models and the moment of emergence of curatorial culture in which, apart from losing the clean boundaries between genres and the media, the viewers take on the role of distributors and co-creators of the narrative. The text does not only stay within the code of the television and the mythical code but it also presents these codes in their direct, simple and clear form. This form of storytelling, harmonised with the precise selection of the initial moment of text distribution that strongly contextualises it, contributes to the creation of its meaning, enhances its distribution and ensures the global success of the text

Network constraints on learnability of probabilistic motor sequences

Human learners are adept at grasping the complex relationships underlying incoming sequential input. In the present work, we formalize complex relationships as graph structures derived from temporal associations in motor sequences. Next, we explore the extent to which learners are sensitive to key variations in the topological properties inherent to those graph structures. Participants performed a probabilistic motor sequence task in which the order of button presses was determined by the traversal of graphs with modular, lattice-like, or random organization. Graph nodes each represented a unique button press and edges represented a transition between button presses. Results indicate that learning, indexed here by participants' response times, was strongly mediated by the graph's meso-scale organization, with modular graphs being associated with shorter response times than random and lattice graphs. Moreover, variations in a node's number of connections (degree) and a node's role in mediating long-distance communication (betweenness centrality) impacted graph learning, even after accounting for level of practice on that node. These results demonstrate that the graph architecture underlying temporal sequences of stimuli fundamentally constrains learning, and moreover that tools from network science provide a valuable framework for assessing how learners encode complex, temporally structured information.Comment: 29 pages, 4 figure

Three Stories

Književni prijevo

Quantum dynamics of a vibrational mode of a membrane within an optical cavity

Optomechanical systems are a promising candidate for the implementation of quantum interfaces for storing and redistributing quantum information. Here we focus on the case of a high-finesse optical cavity with a thin vibrating semitransparent membrane in the middle. We show that robust and stationary optomechanical entanglement could be achieved in the system, even in the presence of nonnegligible optical absorption in the membrane. We also present some preliminary experimental data showing radiation-pressure induced optical bistability.Comment: 6 pages, 2 figures. Work presented at the conference QCMC 2010 held on 19-23 July 2010 at the University of Queensland, Brisbane, Australi

Quantum dynamics of a high-finesse optical cavity coupled with a thin semi-transparent membrane

We study the quantum dynamics of the cavity optomechanical system formed by a Fabry-Perot cavity with a thin vibrating membrane at its center. We first derive the general multimode Hamiltonian describing the radiation pressure interaction between the cavity modes and the vibrational modes of the membrane. We then restrict the analysis to the standard case of a single cavity mode interacting with a single mechanical resonator and we determine to what extent optical absorption by the membrane hinder reaching a quantum regime for the cavity-membrane system. We show that membrane absorption does not pose serious limitations and that one can simultaneously achieve ground state cooling of a vibrational mode of the membrane and stationary optomechanical entanglement with state-of-the-art apparatuses.Comment: 14 pages, 7 figure