d0 Ferromagnetic Interface Between Non-magnetic Perovskites

We use computational and experimental methods to study d0 ferromagnetism at a charge- imbalanced interface between two perovskites. In SrTiO3/KTaO3 superlattice calculations, the charge imbalance introduces holes in the SrTiO3 layer, inducing a d0 ferromagnetic half-metallic 2D electron gas at the interface oxygen 2p orbitals. The charge imbalance overrides doping by vacancies at realistic concentrations. Varying the constituent materials shows ferromagnetism to be a gen- eral property of hole-type d0 perovskite interfaces. Atomically sharp epitaxial d0 SrTiO3/KTaO3, SrTiO3 /KNbO3 and SrTiO3 /NaNbO3 interfaces are found to exhibit ferromagnetic hysteresis at room temperature. We suggest the behavior is due to high density of states and exchange coupling at the oxygen t1g band in comparison with the more studied d band t2g symmetry electron gas.Comment: 5 pages, 5 figure

A hybrid iterative method for common solutions of variational inequality problems and fixed point problems for single-valued and multi-valued mappings with applications

Revie

Globalization, Peace & Stability, Governance, and Knowledge Economy

A previous analysis of the impact of formal institutions on the knowledge economy of 22 Middle-Eastern and Sub-Sahara African countries during the 1996-2010 time period concluded that formal institutions were necessary, but inadequate, determinants of the knowledge economy. To extend that study, this paper claims that globalization induces peace and stability, which affects governance and through governance the knowledge economy. The claim addresses one weakness of previous research that did not consider the effects on the knowledge economy of globalization. We model the proposition as a three-stage process in four hypotheses, and estimate each hypothesis using robust estimators that are capable of dealing with the usual statistical problems without sacrificing economic relevance and significance. The results indicate that globalization has varying effects on peace and stability, and peace and stability affect governance differently depending on what kind of globalization induces it. For instance, the effects on governance induced by globalization defined as trade are stronger than those resulting from globalization taken to be foreign direct investment. Hence, we conclude that foreign direct investment is not a powerful mechanism for stimulating and sustaining the knowledge economy in our sample of countries. However, since globalization-induced peace and stability have both positive and negative effects on governance simultaneously, we also conclude that while the prospect for knowledge economy in African countries is dim, it is still realistic and attainable as long as these countries continue to engage in the kind of globalization that does indeed induce peace and stability. We further conclude that there is a need for a sharper focus on economic and institutional governance than on general governance as one possible extension of this paper

Teorie a aplikace magnetofluidni mechaniky.

The shaping of a liquid metal drop using high-frequency magnetic fields is investigated experimentally, numerically and analytically. The motivation for this study comes from electron beam evaporation of liquid metals. In this process, turbulent convection within the melt leads to highly unwelcome heat losses through the water-cooled side walls of the crucible. Therefore, to increase efficiency, it would be favourable to fix the melt puddle horizontally by magnetic field. In the experiments drops of the low-melting liquid metal GaInSn are used. The drop surface is submitted to electromagnetic pressure generated by an inductor that is fed by high-frequency electrical current. I record the contour of drops of variable volume while varying inductor current and frequency. The results are compared with predictions of both a simple analytical model and numerical simulations.Summery also in German.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Additional Precipitation Reactions of Lectins with Human Serum Glycoproteins

Peer Reviewe

Hodnocení stavu životního prostředí: Monitoring cizorodých látek v potravních řetězcích:Monitoring vybraných cizorodých látek ve vybraných složkách flory a fauny

Při sledování organických kontaminantů ve vybraných složkách ekosystému České republiky byla zohledněna tato kritéria: toxické, případně genotoxické účinky, perzistence resp. delší doba přetrvávání ve složkách prostředí, bioakumulační materiál, rozsah průniku do životního prostředí, regulace národními a mezinárodními konvencemi. byly vyšetřovány matrice rostlinného a živočišného původu - zemědělské produkty a další komponenty potravního řetězce člověka a rostlinné a živočišné matrice charakteru bioindikátorů. Jsou stručně shrnuta fakta, která slouží jako východisko bezprostředně se vztahující k interpretaci výsledků nálezů sledovaných látek