RECONSTRUCTION OF PALEOBASINS OF LARGE LAKE SYSTEMS OF THE SOUTHEASTERN PERIPHERY OF THE CANDINAVIAN ICE SHEET IN THE LATE PLEISTOCENE

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Effect of local Coulomb interactions on the electronic structure and exchange interactions in Mn12 magnetic molecules

We have studied the effect of local Coulomb interactions on the electronic structure of the molecular magnet Mn12-acetate within the LDA+U approach. The account of the on-site repulsion results in a finite energy gap and an integer value of the molecule's magnetic moment, both quantities being in a good agreement with the experimental results. The resulting magnetic moments and charge states of non-equivalent manganese ions agree very well with experiments. The calculated values of the intramolecular exchange parameters depend on the molecule's spin configuration, differing by 25-30% between the ferrimagnetic ground state and the completely ferromagnetic configurations. The values of the ground-state exchange coupling parameters are in reasonable agreement with the recent data on the magnetization jumps in megagauss magnetic fields. Simple estimates show that the obtained exchange parameters can be applied, at least qualitatively, to the description of the spin excitations in Mn12-acetate.Comment: RevTeX, LaTeX2e, 4 EPS figure

Supersymmetry, Axions and Cosmology

Various authors have noted that in particular models, the upper bound on the axion decay constant may not hold. We point out that within supersymmetry, this is a generic issue. For large decay constants, the cosmological problems associated with the axion's scalar partner are far more severe than those of the axion. We survey a variety of models, both for the axion multiplet and for cosmology, and find that in many cases where the cosmological problems of the saxion are solved, the usual upper bound on the axion is significantly relaxed. We discuss, more generally, the cosmological issues raised by the pseudoscalar members of moduli multiplets, and find that they are potentially quite severe.Comment: 27 pages, published version, some discussions clarifie

Important professional qualities of patient safety specialists

The study of individual characteristics of the patient safety culture was conducted in various Ukrainian health care facilities using the questionnaire of the Agency for Healthcare Research and Quality's (AHRQ). The characteristics of the patient safety culture were analyzed by taking into account the length of service, membership of respondent to medical or nursing staff, and the profile of therapeutic or surgical activity. The essential professional qualities of patient safety specialists and the categories of persons who are the most suitable candidates for the training of patient safety specialists were defined. It was noted that training specialists to ensure patients safety, taking into account professionally essential qualities, becomes especially relevant in connection with the transition from the culture of blaming individuals for mistakes to the practice of a fair culture, in which mistakes are not considered as a personal oversight, but as an opportunity to improve the system and prevent future harm. It was found that the nursing staff rated patient safety on wards lower than in hospital. A greater risk of adverse event reporting was found for surgical workers and a reduced risk of adverse event reporting for workers with 21 years of experience or more compared to workers with five years of experience or less. Based on the conducted research, it was concluded that the most suitable candidates for training patient safety specialists would be surgeons with 5 years of experience, who are critical as for patient safety in their units and prone to disclose adverse events

Spin, charge and orbital ordering in ferrimagnetic insulator YBaMn2_2O5_5

The oxygen-deficient (double) perovskite YBaMn$_2$O$_5$, containing corner-linked MnO$_5$ square pyramids, is found to exhibit ferrimagnetic ordering in its ground state. In the present work we report generalized-gradient-corrected, relativistic first-principles full-potential density-functional calculations performed on YBaMn$_2$O$_5$ in the nonmagnetic, ferromagnetic and ferrimagnetic states. The charge, orbital and spin orderings are explained with site-, angular momentum- and orbital-projected density of states, charge-density plots, electronic structure and total energy studies. YBaMn$_2$O$_5$ is found to stabilize in a G-type ferrimagnetic state in accordance with experimental results. The experimentally observed insulating behavior appears only when we include ferrimagnetic ordering in our calculation. We observed significant optical anisotropy in this material originating from the combined effect of ferrimagnetic ordering and crystal field splitting. In order to gain knowledge about the presence of different valence states for Mn in YBaMn$_2$O$_5$ we have calculated $K$-edge x-ray absorption near-edge spectra for the Mn and O atoms. The presence of the different valence states for Mn is clearly established from the x-ray absorption near-edge spectra, hyperfine field parameters and the magnetic properties study. Among the experimentally proposed structures, the recently reported description based on $P$4/$nmm$ is found to represent the stable structure

Magnetic resonance imaging on sodium nuclei: potential medical applications of 23Na MRI

Sodium is a key element in a living organism. The increase of its concentration is an indicator of many pathological conditions. 23Na magnetic resonance imaging (MRI) is a quantitative method that allows to determine the sodium content in tissues and organs in vivo. This method has not yet entered clinical practice widely, but it has already been used as a clinical research tool to investigate diseases such as brain tumors, breast cancer, stroke, multiple sclerosis, hypertension, diabetes, ischemic heart disease, osteoarthritis. The active development of the 23Na MRI is promoted by the growth of available magnetic elds, the expansion of hardware capabilities, and the development of pulse sequences with ultra-short echo time

Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at √s=0.9 and 2.36 TeV

Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at root s = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dN(ch)/d eta vertical bar(vertical bar eta vertical bar and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date

RECONSTRUCTION OF PALEOBASINS OF LARGE LAKE SYSTEMS OF THE SOUTHEASTERN PERIPHERY OF THE CANDINAVIAN ICE SHEET IN THE LATE PLEISTOCENE

11-1