696 research outputs found
The fairy tale pillows of Slavka Maneva
No full textThis paper examines the collection of short stories, more precisely fairy tales by Slavka Maneva, titled as "Starry pillows”. The collection shows unusual narrative procedure, where the months of the year, each characterized by something, give to the children fairy tales as gifts and the last one is from the author herself. These fairy tales have all the characteristics of a tale: the time and place where the events take place are not familiar; here we find mythological creatures, magical elements and fairy tales that are presented as legends which are part of the mythology.
Key words: fairy tale, Slavka Maneva, Macedonian literature for children
Works Created Within the Employment Relationship
No full textThe research and analysis of the creative achievements created in the context of employment, have always asked a number of questions related to the nature of these works, with the rights that arise for the employer and author, with the manner of their enforcement and payment of fair remuneration. The institute of the official work is established both in the system of copyright and in industrial legislation. It is a means of regulating the relationship between employer and creator. Theory and practice increasingly determine the need for deeper and more comprehensive regulation of these relations and overcoming the existing gaps.</jats:p
Generation and evolution of anisotropic turbulence and related energy transfer in drifting proton-alpha plasmas
No full text© ESO 2018. The power spectra of magnetic field fluctuations in the solar wind typically follow a power-law dependence with respect to the observed frequencies and wave-numbers. The background magnetic field often influences the plasma properties, setting a preferential direction for plasma heating and acceleration. At the same time the evolution of the solar-wind turbulence at the ion and electron scales is influenced by the plasma properties through local micro-instabilities and wave-particle interactions. The solar-wind-plasma temperature and the solar-wind turbulence at sub- and sup-ion scales simultaneously show anisotropic features, with different components and fluctuation power in parallel with and perpendicular to the orientation of the background magnetic field. The ratio between the power of the magnetic field fluctuations in parallel and perpendicular direction at the ion scales may vary with the heliospheric distance and depends on various parameters, including the local wave properties and nonthermal plasma features, such as temperature anisotropies and relative drift speeds. In this work we have performed two-and-a-half-dimensional hybrid simulations to study the generation and evolution of anisotropic turbulence in a drifting multi-ion species plasma. We investigate the evolution of the turbulent spectral slopes along and across the background magnetic field for the cases of initially isotropic and anisotropic turbulence. Finally, we show the effect of the various turbulent spectra for the local ion heating in the solar wind.sponsorship: Y.M. would like to acknowledge A. F. Vinas and P. Moya for various fruitful discussions throughout the early stages of this work. This study has been funded under FWO - Research Foundation Flanders: Postdoctoral Fellowship grant 12K1416N. The work had also received funding from projects C 90347 (ESA Prodex), GOA/2015-014 (KU Leuven) and G.0A23.16N (FWO-Vlaanderen). (FWO - Research Foundation Flanders|12K1416N, ESA Prodex|C 90347, KU Leuven|GOA/2015-014, FWO-Vlaanderen|G.0A23.16N)status: Publishe
Preferential heating of Oxygen 5+ ions by finite-amplitude oblique Alfven waves
No full text© 2016 AIP Publishing LLC. Minor ions in the fast solar wind are known to have higher temperatures and to flow faster than protons in the interplanetary space. In this study we combine previous research on parametric instability theory and 2.5D hybrid simulations to study the onset of preferential heating of Oxygen 5+ ions by large-scale finite-Amplitude Alfvén waves in the collisionless fast solar wind. We consider initially non-drifting isotropic multi-species plasma, consisting of isothermal massless fluid electrons, kinetic protons and kinetic Oxygen 5+ ions. The external energy source for the plasma heating and energization are oblique monochromatic Alfvén-cyclotron waves. The waves have been created by rotating the direction of initial parallel pump, which is a solution of the multi-fluid plasma dispersion relation. We consider propagation angles θ ≤ 30°. The obliquely propagating Alfvén pump waves lead to strong diffusion in the ion phase space, resulting in highly anisotropic heavy ion velocity distribution functions and proton beams. We discuss the application of the model to the problems of preferential heating of minor ions in the solar corona and the fast solar wind.sponsorship: We would like to acknowledge P. Moya for numerous fruitful discussions and help with the oblique waves solver. This work has been funded by projects C 90347 (ESA Prodex), GOA/2015-014 (KU Leuven) and G.0729.11 (FWO-Vlaanderen). The research leading to these results has received funding from the European Commissions Seventh Framework Programme (FP7/2007-2013) under the grant agreement SOLSPANET (project 269299, www.solspanet.eu). This study has also been funded by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (IAP P7/08 CHARM). The computations were performed on the VSC Flemish Supercomputer Center, funded by the Hercules foundation and the Flemish Government - department EWI. The study was completed under FWO - Research Foundation Flanders: Postdoctoral Fellowship grant 12K1416N. (ESA Prodex|C 90347, KU Leuven|GOA/2015-014, FWO-Vlaanderen|G.0729.11, European Commissions Seventh Framework Programme (FP7)|269299, Interuniversity Attraction Poles Programme, Belgian Science Policy Office|IAP P7/08 CHARM, Hercules foundation, Flemish Government - department EWI, FWO - Research Foundation Flanders: Postdoctoral Fellowship|12K1416N)status: Publishe
Maurice Ravel\u27s La Valse : Historical context, structure, harmony, and challenges for interpretation in the solo piano version.
No full textThe solo piano version of La Valse is well worthy of study and performance, but it has often been unjustly neglected in reviews of Maurice Ravel\u27s piano music. This paper analyzes the piece in its historical context, emphasizing the important role of the dance in Ravel\u27s music. La Valse was originally written as a choreographic poem for a ballet performance. It was only later transcribed for two pianos and also for solo piano. While this paper focuses on the solo piano version, it also reviews the orchestral and the two-piano versions. The thematic, harmonic, and rhythmic aspects of this musical masterpiece are examined in light of the author\u27s compositional principles embodied in the piece. In the chain of waltzes that comprise the piece, ten distinct melodic themes are identified and illustrated with musical examples. The paper discusses the melodic material, phrase structure, scales and modes, and frequency of appearance of each of these themes. Rather than being based on a particular major or minor scale or mode, La Valse is organized around pedal point centers which function as temporary points of tonic stability, combined with chromaticism. These provide the piece\u27s unique charm. Further in the paper, I review the tempo, rhythm, and meter of the piece, highlighting the departures from the typical waltz. Finally, the paper discusses the challenges of performing the solo piano version and suggests how performers might resolve these pianistic and musical issues, such as three-staves writing and glissandi. Key to a successful performance is highlighting the melody while achieving variety in the numerous repetitions of the themes. In some extraordinarily difficult passages, the solo pianist must show creativity and transcribe the piece once again. As soon as the technical and creative challenges are resolved, the pianist and the audience alike are rewarded with a beautiful and truly unforgettable piece
Ion acoustic wave damping in a non-Maxwellian bi-ion electron plasma in the presence of dust
No full textIn this work, we investigate the properties of ion acoustic waves generated by negative heavy ions in a multi-component non-Maxwellian electrostatic plasma, consisting of electrons, positive and negative heavy ions, and a background population of dust particles. In the absence of external energy source and collisions, the ion acoustic waves are subject to Landau damping. We perform a collisionless linear instability analysis within a slow damping approximation and study the effect
of various plasma conditions on the damping rate. Our model is highly relevant to multi-ion laboratory plasmas and has been applied to K– SF6 and K– C7F14 mixtures in particular.sponsorship: Y.M. would like to acknowledge the support from FWO-Research Foundation Flanders: Postdoctoral Fellowship Grant No. 12K1416N. The work had also received funding from projects C 90347 (ESA Prodex), GOA/2015-014 (KU Leuven) and G.0A23.16N (FWO-Vlaanderen). (FWO-Research Foundation Flanders|12K1416N, ESA Prodex|C 90347, KU Leuven|GOA/2015-014, FWO-Vlaanderen|G.0A23.16N)status: Publishe
Threshold Ring Signatures Efficient for Large Sets of Signers
No full textThe anonymity provided by the threshold ring signature scheme proposed by Bresson et al (Crypto'02) is perfect. However, its complexity is prohibitively large even for relatively small sets of signers. We propose use of threshold schemes based on covering designs that are efficient for large groups of signers. The cost we pay is non-perfect anonymity
Sphingosine kinase 2 deficiency increases proliferation and migration of renal mouse mesangial cells and fibroblasts
No full textBoth of the sphingosine kinase (SK) subtypes SK-1 and SK-2 catalyze the production of the bioactive lipid molecule sphingosine 1-phosphate (S1P). However, the subtype-specific cellular functions are largely unknown. In this study, we investigated the cellular function of SK-2 in primary mouse renal mesangial cells (mMC) and embryonic fibroblasts (MEF) from wild-type C57BL/6 or SK-2 knockout (SK2ko) mice. We found that SK2ko cells displayed a significantly higher proliferative and migratory activity when compared to wild-type cells, with concomitant increased cellular activities of the classical extracellular signal regulated kinase (ERK) and PI3K/Akt cascades, and of the small G protein RhoA. Furthermore, we detected an upregulation of SK-1 protein and S1P3 receptor mRNA expression in SK-2ko cells. The MEK inhibitor U0126 and the S1P1/3 receptor antagonist VPC23019 blocked the increased migration of SK-2ko cells. Additionally, S1P3ko mesangial cells showed a reduced proliferative behavior and reduced migration rate upon S1P stimulation, suggesting a crucial involvement of the S1P3 receptor. In summary, our data demonstrate that SK-2 exerts suppressive effects on cell growth and migration in renal mesangial cells and fibroblasts, and that therapeutic targeting of SKs for treating proliferative diseases requires subtype-selective inhibitors
THE RADIOPROTECTIVE EFFECT OF PHASEOLUS VULGARIS PHYTOHEMAGGLUTININS EXERTED ON VITIA FABA GERMS
No full textNo abstract
Ion acoustic wave damping in a non-Maxwellian bi-ion electron plasma in the presence of dust
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