Invertible bimodule categories over the representation category of a Hopf algebra

For any finite-dimensional Hopf algebra $H$ we construct a group homomorphism \biga(H)\to \text{BrPic}(\Rep(H)), from the group of equivalence classes of $H$-biGalois objects to the group of equivalence classes of invertible exact \Rep(H)-bimodule categories. We discuss the injectivity of this map. We exemplify in the case $H=T_q$ is a Taft Hopf algebra and for this we classify all exact indecomposable \Rep(T_q)-bimodule categories.Comment: 26 pages. Accepted in Journal of Pure and Applied Algebr

Are words easier to learn from infant- than adult-directed speech? A quantitative corpus-based investigation

We investigate whether infant-directed speech (IDS) could facilitate word form learning when compared to adult-directed speech (ADS). To study this, we examine the distribution of word forms at two levels, acoustic and phonological, using a large database of spontaneous speech in Japanese. At the acoustic level we show that, as has been documented before for phonemes, the realizations of words are more variable and less discriminable in IDS than in ADS. At the phonological level, we find an effect in the opposite direction: the IDS lexicon contains more distinctive words (such as onomatopoeias) than the ADS counterpart. Combining the acoustic and phonological metrics together in a global discriminability score reveals that the bigger separation of lexical categories in the phonological space does not compensate for the opposite effect observed at the acoustic level. As a result, IDS word forms are still globally less discriminable than ADS word forms, even though the effect is numerically small. We discuss the implication of these findings for the view that the functional role of IDS is to improve language learnability.Comment: Draf

Sources of Information in the Life of Pupils in the 1st Grade of Primary School

AbstractThe paper concerns the research results. A significant role in the education process of the young generation in the 21st century and in their lives in general is played by media - both “traditional” that has accompanied mankind for hundreds of years and those whose presence can be counted by decades. The aim of the research is to identify where, pupils in the 1st grade of primary school look for information outside of the classroom that interests them and that they need for school (in the field of Human and the World). The secondary objectives include identification of what sources of information pupils usually work; an explanation of how school support the work of pupils with information and to describe the attitudes of children to printed and electronic sources of information. As the main research method a custom design questionnaire is chosen that was administered to the 4th and 5th grades of primary schools

Impact of Terms-of-Trade on Business Cycles of Slovakia, Czech Republic and Croatia

Different theoretical and empirical studies lead to the different results. Different theories suggest a positive as well as a negative relation between the terms-of-trade and trade balance. The traditional Keynesian Harberger-Laursen-Metzler effect of the terms-of-trade on the trade balance is positive. According to the Obsfeld-Svensson-Razin effect the positive relation between the terms-of-trade and trade balance is the smaller, the higher a persistence of the terms-of-trade shocks is. The empirical studies do not support statistically significant impact of the terms-of-trade on the output in the developing countries. The goal of the paper is to verify an impact of the terms-of-trade on the Slovak Czech and Croatian business cycles and trade balances. Using the structural vector auto-regression analysis of the terms-of-trade, trade balance, output, consumption and investment cyclical components, we show that the relationship between the terms-of-trade and trade-balance is negative in the Slovak and Czech economy. The relationship between the terms-of-trade and trade-balance is statistically insignificant in the Croatian economy. Terms-of-trade shocks explain only small fraction of business cycles in the Slovak, Czech and Croatian economies. Data exhibit Obstfeld-Svensson-Razin effect of the terms-of-trade on the trade balance. This work is licensed under a&nbsp;Creative Commons Attribution-NonCommercial 4.0 International License.</p

Impact of Terms-of-Trade on Business Cycles of Slovakia, Czech Republic and Croatia

Different theoretical and empirical studies lead to the different results. Different theories suggest a positive as well as a negative relation between the terms-of-trade and trade balance. The traditional Keynesian Harberger-Laursen-Metzler effect of the terms-of-trade on the trade balance is positive. According to the Obsfeld-Svensson-Razin effect the positive relation between the terms-of-trade and trade balance is the smaller, the higher a persistence of the terms-of-trade shocks is. The empirical studies do not support statistically significant impact of the terms-of-trade on the output in the developing countries. The goal of the paper is to verify an impact of the terms-of-trade on the Slovak Czech and Croatian business cycles and trade balances. Using the structural vector auto-regression analysis of the terms-of-trade, trade balance, output, consumption and investment cyclical components, we show that the relationship between the terms-of-trade and trade-balance is negative in the Slovak and Czech economy. The relationship between the terms-of-trade and trade-balance is statistically insignificant in the Croatian economy. Terms-of-trade shocks explain only small fraction of business cycles in the Slovak, Czech and Croatian economies. Data exhibit Obstfeld-Svensson-Razin effect of the terms-of-trade on the trade balance. This work is licensed under a&nbsp;Creative Commons Attribution-NonCommercial 4.0 International License.</p

Asymmetric Reactions of Retail Gasoline Prices on the Changes in Crude Oil Prices in Chosen US Cities

Many empirical studies state that retail gasoline and diesel prices react more quickly when the crude oil price rises rather than decreases. In the paper, we confirm these asymmetric reactions of retail fuel prices in selected cities in the United States of America. We use the adjustment cost function in the linear-exponential form to derive nonlinear retail gasoline and diesel reaction functions. The correspondent model is estimated with the system\u27s generalised method of moments. The model allows us to compute average one-gallon gasoline and diesel price biases from the increase in oil by one dollar per barrel caused by the given asymmetric reactions. The average biases differ from city to city; their values are between 0.02 cents in Los Angeles and 0.44 cents in Cleveland

Long-Run Elasticity of the Substitution in the Slovak Economy

The value of the Slovak long-run elasticity substitution is relatively slow – about 0.10. It follows from the estimate of low-frequency econometric model. Econometric form is given by the capital demand derived from the first-order conditions of the firm maximizing its profit. Due to the robustness we use different measures of the economic variables. The basic data gathered from the National Bank of Slovakia data portal consists of the real and nominal output, nominal capital, output price and different interest rates. A challenge is to find real capital time series. One way is to use a net investment deflator computed from the real and nominal gross fixed investment and the consumption of the fixed capital. The low-pass filter of data series is used to measure the long-run value of variables. This work is licensed under a&nbsp;Creative Commons Attribution-NonCommercial 4.0 International License.</p

Syndesmis patagonica n. sp. (Rhabdocoela: Umagillidae) from the sea urchin Arbacia dufresnii (Echinodermata: Echinoidea) in Patagonia, Argentina

The umagillid Syndesmis patagonica n. sp. is described from the intestinal tract of the sea urchin Arbacia dufresnii, which represents a new host record for the genus. The hosts were collected from the coast of Patagonia (Argentina), and S. patagonica n. sp. is the first species of Syndesmis reported from South America. Syndesmis patagonica n. sp. can be distinguished from all other species in the genus by the possession of a stylet that is extremely short (less than 50 µm long), and a combination of other characters including the position of the testes, body size, body color and host. An updated overview of the distribution of all species of Syndesmis is also presented.Fil: Brogger, Martin Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Ivanov, Veronica Adriana. Universidad de Buenos Aires. Facultad de Cs.exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Laboratorio de Helmintologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Analysis of Asymmetry in Slovak Gasoline and Diesel Retail Market

In this paper we examine if Slovak retail gasoline and diesel prices respond more quickly when crude oil price rises rather than when it decreases. The error correction model with irreversible behaviour of explanatory variables is considered to be basic tool for the analysis of asymmetric retail price reaction of gasoline and diesel. The explanatory variable is divided into two variables, the positive and the negative differences implying a price increase and a price decrease. Due to the link between the gasoline and diesel markets, we assume a common co-integration relationship. Therefore, we also estimate vector error correction model in our analysis. The both model approaches reject expected asymmetry in the retail price reactions on crude oil changes. This work is licensed under a&nbsp;Creative Commons Attribution-NonCommercial 4.0 International License.</p

Elasticity of Substitution in Post-Communist Economies

In our research we estimate the elasticity of substitution post-communist economies integrated in European Union. There are many approaches to estimate the production function coefficients as the elasticity of substitution. We argue that a frequency panel model is suitable econometric tool for our purposes. We derive the specification from the capital demand first-order condition of firm maximising its profit. Data are adapted from the World Penn Tables and World Development Indicators, World Bank. Data are modified with band-pass filter to abstract them from the business cycles and the short-term effects driven by different underlying processes. The filter creates overlapping observations, the stochastic term is serially correlated and therefore feasible generalized least squares estimator is used. Comparing the results with the relevant results in a world literature we estimate relatively low value of the elasticity of substitution in European post-communist countries. Possible explanations are discussed. This work is licensed under a&nbsp;Creative Commons Attribution-NonCommercial 4.0 International License.</p