230 research outputs found
Stanislaw Celestyn Napiorkowski, Matka mojego Pana. (Problemy - poszukiwania - perspektywy). 1988
No full textKijas Z. Stanislaw Celestyn Napiorkowski, Matka mojego Pana. (Problemy - poszukiwania - perspektywy). 1988. In: Revue théologique de Louvain, 22ᵉ année, fasc. 1, 1991. p. 118
Stanislaw Celestyn Napiorkowski, Matka mojego Pana. (Problemy - poszukiwania - perspektywy). 1988
No full textKijas Z. Stanislaw Celestyn Napiorkowski, Matka mojego Pana. (Problemy - poszukiwania - perspektywy). 1988. In: Revue théologique de Louvain, 22ᵉ année, fasc. 1, 1991. p. 118
Calculation of the critical temperature of a dilute Bose gas in the Bogoliubov approximation
No full textFollowing an earlier calculation in 3D, we calculate the 2D critical temperature of a dilute, translation-invariant Bose gas using a variational formulation of the Bogoliubov approximation introduced by Critchley and Solomon in 1976. This provides the first analytical calculation of the Kosterlitz-Thouless transition temperature that includes the constant in the logarithm
Production of 117mSn in natCd and natIn targets with an α-beam
Get PDFThe conversion electrons and gamma-rays emitter Sn-117m is a promising theranostic radionuclide produced mainly at nuclear reactors with low specific activity. The variety of possible applications suggests the necessity of a larger production, more likely reachable at cyclotrons. The irradiation of Cd-nat and In-nat targets with the 30 MeV alpha-beam, available at the Heavy Ion Laboratory (HIL) of Warsaw, aims to measure the production cross-sections of Sn-117m and its contaminants. Theoretical calculations are also performed to support the experimental results
Measurement of the γ decay from the energy region of the pygmy dipole states excited in the 208pb(p; P'γ) reaction at ccb
Get PDFFor a few years, the medical cyclotron Proteus C-235 at the Cyclotron Centre Bronowice in Kraków, Poland has been regularly used for nuclear structure experiments. One of the ongoing studies is focused on the γdecay of collective states populated in (p; p'γ) reactions. In a recent experiment, γ decays of excited states in the energy region of the Pygmy Dipole States in 208Pb have been observed. Good efficiency and energy resolution provided by the PARIS clusters and LaBr3:Ce scintillators facilitate a comparison of the obtained energy spectra with previous measurements of pygmy states in this nucleus
3′′ × 3′′ LaBr3:Ce detector response to monochromatic protons
No full textWe investigated the response of a 3′′ × 3′′ (7.62 cm × 7.62 cm) LaBr3:Ce detector to monochromatic protons within an energy range of 70-230 MeV. The experiment was performed at the new cyclotron at the Cyclotron Centre Bronowice (CCB) of the Henryk Niewodniczański Institute of Nuclear Physics, Krakow, Poland. Protons with energies between 70 and 185 MeV were stopped inside the crystal. Three different values of PMT high voltage were used, in each case, the energy resolution, the quenching factor with respect to the gamma rays were measured. In addition, the anode pulses were acquired for both gamma rays (from a CmC source) and protons and the comparison between them will be shown
On the importance of training methods and ensemble aggregation for runoff prediction by means of artificial neural networks
No full textArtificial neural networks (ANNs) become widely used for runoff forecasting in numerous studies. Usually classical gradient-based methods are applied in ANN training and a single ANN model is used. To improve the modelling performance, in some papers ensemble aggregation approaches are used whilst in others, novel training methods are proposed. In this study, the usefulness of both concepts is analysed. First, the applicability of a large number of population-based metaheuristics to ANN training for runoff forecasting is tested on data collected from four catchments, namely upper Annapolis (Nova Scotia, Canada), Biala Tarnowska (Poland), upper Allier (France) and Axe Creek (Victoria, Australia). Then, the importance of the search for novel training methods is compared with the importance of the use of a very simple ANN ensemble aggregation approach. It is shown that although some metaheuristics may slightly outperform the classical gradient-based Levenberg-Marquardt algorithm for a specific catchment, none performs better for the majority of the tested ones. One may also point out a few metaheuristics that do not suit ANN training at all. On the other hand, application of even the simplest ensemble aggregation approach clearly improves the results when the ensemble members are trained by any suitable algorithms.EDITOR D. Koutsoyiannis; ASSOCIATE EDITOR E. Toth EDITOR D. Koutsoyiannis; ASSOCIATE EDITOR E. Toth</p
Quantum wetting transitions in two dimensions: An alternative path to non-universal interfacial singularities
No full textWe consider two-dimensional (d = 2) systems with short-ranged microscopic interactions, where interface unbinding (wetting) transitions occur in the limit of vanishing temperature T. For T = 0 the transition is characterized by non-universal critical properties analogous to those established for thermal wetting transitions in d = 3, albeit with a redefined capillary parameter (omega) over tilde. Within a functional renormalization-group treatment of an effective interfacial model, we compute the finite-temperature phase diagram, exhibiting a line of interface unbinding transitions, terminating at T = 0 with an interfacial quantum-critical point. We identify distinct scaling regimes, reflecting the interplay between quantum and thermal interfacial fluctuations. A crossover line marking the onset of the quantum-critical regime is described by the d = 3 interfacial correlation-length exponent nu(parallel to). This potentially opens another way to investigate the non-universal character of nu(parallel to). On the other hand, the emergent interfacial quantum-critical regime shows no signatures of non-universality. Copyright (C) EPLA, 201
- …
