Exchange rate and oil price interactions in transition economies: Czech republic, Hungary and Poland

This study investigates causal dynamics between crude oil prices and exchange rates in Czech Republic, Poland and Hungary by employing monthly data from the beginning of flexible exchange regime in each country to December 2011. The study benefits from the recent advance in the time series econometric analysis and carries out linear causality, non-linear causality, volatility spillover and frequency domain causality tests. The frequency domain causality analysis results imply that oil price fluctuations affect real exchange rates in the long run in Poland and Czech Republic. On the other hand, frequency domain causality test results indicate that oil price fluctuations do not affect exchange rate in any period in Hungary despite its economy’s high imported energy dependency. © 2015, Savez Ekonomista Vojvodine. All rights reserved

Effects of reinforcement learning on gaze following of gaze and head direction in early infancy: An interactive eye‐tracking study

The current four experiments investigated gaze following behavior in response to gaze and head turns in 4‐month‐olds and how reinforcement learning influences this behavior (N = 99). Using interactive eye tracking, infants’ gaze elicited an animation whenever infants followed a person’s head or gaze orientation (Experiment 1.1, 2.1 and 2.2) or looked at the opposite side (Experiment 1.2). Infants spontaneously followed the direction of a turning head with and without simultaneously shifted gaze direction (Cohen’s d: 0.93–1.05) but not the direction of isolated gaze shifts. We only found a weak effect of reinforcement on gaze following in one of the four experiments. Results will be discussed with regard to the impact of reinforcement on the maintenance of already existing gaze following behavior

Efecto estacional sobre la composición de ácidos grasos de fosfolípidos y triacilgliceroles de machos de Capoeta umbla

The seasonal changes in muscle tissue, total lipids and fatty acid composition of phospholipids (PL), triacylglycerol (TAG), and phospholipid classes of male Capoeta umbla were investigated in this study. Phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI), and phosphatidylserine (PS) were identified as the major phospholipids (PLs) in the muscle tissue (PS). Triacylglycerols showed high contents of MUFA, 14:0, 16:1n-7, 18:1n-9, 18:2n-6, and 18:3n-3; while phospholipids presented high contents of AA, DHA, and 18:0. Myristic acid, 16:1n-7, 18:1n-9, monounsaturated fatty acids (MUFA), linoleic acid (18:2n-6), and linolenic acid (18:3n-3) were shown to be present in larger concentrations in TAG than in PL classes. In PL classes, 16:0, 18:0, arachidonic acid (20:4n-6) (AA), eicosapentaenoic acid (EPA) (20:5n-3), docosahexaenoic acid (DHA) (22:6n-3) and polyunsaturated fatty acid (ΣPUFA) were higher than the TAG fraction. The fatty acid composition of total lipid and lipid classes (TAG and PL) were affected by the seasonal variations and lipid fraction.En este estudio se investigaron los cambios estacionales en el tejido muscular, la composición total de lípidos y ácidos grasos de fosfolípidos (PL), triacilglicerol (TAG) y clases de fosfolípidos de Capoeta umbla machos. Fosfatidilcolina (PC), fosfatidiletanolamina (PE), fosfatidilinositol (PI) y fosfatidilserina (PS) se identificaron como los principales fosfolípidos (PL) en el tejido muscular (PS). Los triacilgliceroles tenían un alto contenido de 14:0, de los MUFA 16:1n-7 y 18:1n-9 y de poliinsaturados 18:2n-6 y 18:3n-3, mientras que los fosfolípidos tenían un alto contenido de araquidónico (20:4n-6) (AA), docosahexaenoico (22:6n-3) (DHA) y 18:0. Se demostró que el ácido mirístico, los monoinsaturados (MUFA) 16:1n-7 y 18:1n-9, el ácido linoleico (18:2n-6) y el ácido linolénico (18:3n-3), están presentes en concentraciones superiores en TAG que en los PL. En las diferentes clases de PL, los ácidos 16:0, 18:0, AA, eicosapentaenoico (20:5n-3) (EPA), DHA y la suma de ácidos grasos poliinsaturados (ΣPUFA) fueron más altos que la fracción TAG. La composición de ácidos grasos de los lípidos totales y las clases de lípidos (TAG y PL) se vieron afectados por las variaciones estacionales y la fracción lipídica

Duals of noncommutative supersymmetric U(1) gauge theory

Parent actions for component fields are utilized to derive the dual of supersymmetric U(1) gauge theory in 4 dimensions. Generalization of the Seiberg-Witten map to the component fields of noncommutative supersymmetric U(1) gauge theory is analyzed. Through this transformation we proposed parent actions for noncommutative supersymmetric U(1) gauge theory as generalization of the ordinary case.Duals of noncommutative supersymmetric U(1) gauge theory are obtained. Duality symmetry under the interchange of fields with duals accompanied by the replacement of the noncommutativity parameter \Theta_{\mu\nu} with \tilde{\Theta}_{\mu \nu} = \epsilon_{\mu\nu\rho\sigma}\Theta^{\rho\sigma} of the non--supersymmetric case is broken at the level of actions. We proposed a noncommutative parent action for the component fields which generates actions possessing this duality symmetry.Comment: Typos corrected. Version which will appear in JHE

What is on Tap? The Role of Spin in Compact Objects and Relativistic Jets

We examine the role of spin in launching jets from compact objects across the mass scale. Our work includes a total of 37 Seyferts, 11 stellar-mass black holes, and 13 neutron stars. We find that when the Seyfert reflection lines are modeled with Gaussian line features (a crude proxy for inner disk radius and therefore spin), only a slight inverse correlation is found between the Doppler-corrected radio luminosity at 5 GHz (a proxy for jet power) and line width. When the Seyfert reflection features are fit with relativistically-blurred disk reflection models that measure spin, there is a tentative positive correlation between the Doppler-corrected radio luminosity and the spin measurement. Further, when we include stellar-mass black holes in the sample, to examine the effects across the mass scale, we find a slightly stronger correlation with radio luminosity per unit mass and spin, at a marginal significance (2.3 sigma confidence level). Finally, when we include neutron stars, in order to probe lower spin values, we find a positive correlation (3.3 sigma confidence level) between radio luminosity per unit mass and spin. Although tentative, these results suggest that spin may have a role in determining the jet luminosity. In addition, we find a slightly more significant correlation (4.4 sigma confidence level) between radio luminosity per Bolometric luminosity and spin, using our entire sample of black holes and neutrons stars. Again, although tentative, these relations point to the possibility that the mass accretion rate, i.e. Bolometric luminosity, is also important in determining the jet luminosity, in addition to spin. Our analysis suggests that mass accretion rate and disk or coronal magnetic field strength may be the "throttle" in these compact systems, to which the Eddington limit and spin may set the maximum jet luminosity that can be achieved.Comment: 14 pages, 13 Figures, ApJ Accepte

Study of multi black hole and ring singularity apparent horizons

We study critical black hole separations for the formation of a common apparent horizon in systems of $N$ - black holes in a time symmetric configuration. We study in detail the aligned equal mass cases for $N=2,3,4,5$, and relate them to the unequal mass binary black hole case. We then study the apparent horizon of the time symmetric initial geometry of a ring singularity of different radii. The apparent horizon is used as indicative of the location of the event horizon in an effort to predict a critical ring radius that would generate an event horizon of toroidal topology. We found that a good estimate for this ring critical radius is $20/(3\pi) M$. We briefly discuss the connection of this two cases through a discrete black hole 'necklace' configuration.Comment: 31 pages, 21 figure

Consecutive Pictet-Spengler Condensations toward Bioactive 8-Benzylprotoberberines: Highly Selective Total Syntheses of (+)-Javaberine A, (+)-Javaberine B, and (-)-Latifolian A

Enantiopure 8-benzylprotoberberines were synthesized by two consecutive Pictet-Spengler (PS) condensations with protected 3,4-dihydroxyphenylacetaldehydes. The first PS to (+)-(R)-norprotosinomenine was optimized to 90 % ee with 5 mol-% of (R)-TRIP as chiral Bronsted acid (> 99 % ee after trituration). The second PS did not require any catalyst, and its regioselectivity was strongly dependent on the solvent: 99: 1 para selectivity was obtained in trifluoroethanol leading to (+)javaberine A; 81: 19 ortho selectivity was reached in apolar aprotic solvents for the synthesis of (+)-javaberine B. Complete, natural diastereoselectivity was observed in the second PS. Through selective catechol oxidation the spirocyclic alkaloid (-)-latifolian A was prepared from protected (+)-javaberine A

DEEP: A dual EEG pipeline for developmental hyperscanning studies

Cutting-edge hyperscanning methods led to a paradigm shift in social neuroscience. It allowed researchers to measure dynamic mutual alignment of neural processes between two or more individuals in naturalistic contexts. The ever-growing interest in hyperscanning research calls for the development of transparent and validated data analysis methods to further advance the field. We have developed and tested a dual electroencephalography (EEG) analysis pipeline, namely DEEP. Following the preprocessing of the data, DEEP allows users to calculate Phase Locking Values (PLVs) and cross-frequency PLVs as indices of inter-brain phase alignment of dyads as well as time-frequency responses and EEG power for each participant. The pipeline also includes scripts to control for spurious correlations. Our goal is to contribute to open and reproducible science practices by making DEEP publicly available together with an example mother-infant EEG hyperscanning dataset

Supersymmetric field theories and cohomology

Bu çalışmada, genel anlamda süpersimetrik alan teorilerinin kohomolojik yapısı çalışılmıştır. Kohomoloji problemi süpersimetri cebri kullanılarak tanımlanmıştır. Süpersimetrik alan teorilerinin eylemlerinin ilgili çokluların en üst elemanı olduğu kullanılarak elde edilen bu kohomoloji probleminin çözümleri yardımıyla bu eylemlerin düşük boyutlu alan polinomlarının çoklu süpervaryasyonları olarak temsil edilebileceği gösterilmiştir. Bu yaklaşımın bir uygulaması olarak Wess-Zumino modelinin kohomolojik yapısı incelenmiştir. Elde edilen sonuçlardan modelin eyleminin kinetik, kütle ve etkileşme terimlerinin kabuk-dışı süpersimetrik durum için tam olarak düşük boyutlu alan polinomlarının kiral ve/veya anti-kiral çoklu süper varyasyonları ile yazılabileceği gösterilmiştir. Anahtar Kelimeler: Süpersimetri, süpersimetrik alan teorileri, kohomoloji.In this work, the cohomological structure of supersymmetric field theories is studied in a general context. Cohomology problem is defined by using the off-shell structure of the supersymmetry algebra. In order to define a cohomology problem it is crucial to use the two component (Weyl) formalism of the supersymmetry algebra, since each individual component of chiral and anti-chiral supersymmetry generators are nilpotent operators. It is then possible to show that the actions of supersymmetric field theories belong to a class of solutions of this cohomology problem and can be represented as multiple supervariations of some lower dimensional field polynomials due to the fact that the actions of supersymmetric field theories can be viewed as the highest component of respective multiplets. It is also discussed that the aforementioned algebraic structure can be thought as the algebraic source of the well-known non-renormalization theorems of several supersymmetric field theories. As an application of our method, the cohomological structure of Wess-Zumino model is discussed. It is shown that the kinetic, mass and the interaction terms can be constructed from the chiral and/or anti-chiral supervariations of the lower dimensional field polynomials for off-shell supersymmetry. It is then found out that the well known non-renormalization theorems of Wess-Zumino model is related to the terms that can only be written as pure chiral or anti-chiral supervariations of (mass) dimension three fields. Keywords: Supersymmetry, supersymmetric field theories, cohomology