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Number of results: 65
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Abstract

Approach to the heritage of communism have been one of the most important subjects of public debate in Poland. Initially a field of conflict between post-communist leftist and post- ‘Solidarity’ parties, these controversies eventually turned into a conflict between the ‘liberals’ and the ‘conservatives’ from the two main post-‘Solidarity’ political parties – namely, the Civic Platform (Platforma Obywatelska) and Law and Justice (Prawo i Sprawiedliwość). The article reconstructs the most important political debates on de-communisation and ‘vetting’. The other issue highlighted by the author is the heated debates between historians on contemporary history. Subjects such as various forms of resistance against the communist rule, including the post-war armed Underground, along with the question of interpreting documents of the former secret police remain a field of controversies. Recent years have seen the opening of new debates related to the politics of memory and the questions of the role of museums and historical exhibitions in Poland.
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Abstract

Landscape changes of the Gåsbreen glacier and its vicinity since 1899 are described. Maps at 1:50 000 scale of changes of the glacier's elevation and extent for the periods 1938-1961, 1961-1990, 1990-2010, and 1938-2010 are analyzed in comparison with results of the authors' field work in the summer seasons 1983, 1984, 2000, 2005 and 2008. During all the 20th century, the progressive recession of the glacier revealed in a dramatic decrease in the thickness of its lower part, with a small reduction of its area and length. However, further shrinkage produced significant shortening and reduction in area which resulted in final decline of the Goësvatnet glacial dammed lake in 2002. Hence, the lowest (and very thick, up to 150-160 m) part of the former glacier tongue and dammed lake were transformed into a new terraced river valley south of the glacier and a typical marginal zone with glacial landforms north of the glacier. Since 1961, the equilibrium line altitude of the Gåsbreen glacier has risen from ca 350 to ca 500 m a.s.l. and now is located below the very steep rocky walls of the Mehesten mountain ridge, 1378 m a.s.l. Hence, the glacier is being fed by snow avalanches from these rocky walls and much more snow melts during the warmer summer seasons, stimulating a quicker recession of the lowest part of the glacier. This recession may be stopped only by significant climate cooling or increase in snow.
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Abstract

Magnetite nanoparticles have become a promising material for scientific research. Among numerous technologies of their synthesis, co-precipitation seems to be the most convenient, less time-consuming and cheap method which produces fine and pure iron oxide particles applicable to environmental issues. The aim of the work was to investigate how the co-precipitation synthesis parameters, such as temperature and base volume, influence the magnetite nanoparticles ability to separate heavy metal ions. The synthesis were conducted at nine combinations of different ammonia volumes - 8 cm3, 10 cm3, 15 cm3 and temperatures - 30°C, 60°C, 90°C for each ammonia volume. Iron oxides synthesized at each combination were examined as an adsorbent of seven heavy metals: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II). The representative sample of magnetite was characterized using XRD, SEM and BET methods. It was observed that more effective sorbent for majority of ions was produced at 30°C using 10 cm3 of ammonia. The characterization of the sample produced at these reaction conditions indicate that pure magnetite with an average crystallite size of 23.2 nm was obtained (XRD), the nanosized crystallites in the sample were agglomerated (SEM) and the specific surface area of the aggregates was estimated to be 55.64 m2·g-1 (BET). The general conclusion of the work is the evidence that magnetite nanoparticles have the ability to adsorb heavy metal ions from the aqueous solutions. The effectiveness of the process depends on many factors such as kind of heavy metal ion or the synthesis parameters of the sorbent.
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Abstract

In general, it is ben eficial and adaptive to have high self-esteem; however, contingent self-esteem depending on approval is not so advantageous. This article presents research on a Polish version of the Contingent Self-Esteem Scale (CSES), which measures contingent self-esteem. The CSES was administered on a total of 1,199 participants; a range of other instruments were also used to establish the validity of the CSES. The CSES proved to have acceptable internal consistency and validity and factor analyses revealed that it contains four factors: vulnerability to negative opinions, dependence on physical attractiveness, dependence on opinions, and dependence on self-standards. Contingent self-esteem was positively correlated with neuroticism, agreeableness, ruminating, anxiety, and maladaptive perfectionism; it was negatively correlated with general self-esteem and self-efficacy. Mediational analyses confirmed the hypothesis that low general self-esteem causes high rumination about oneself, which in turn is related to high contingent self-esteem.
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