Two-dimensional micromagnetic simulation of domain structures in films with combined anisotropy

The transformation of the domain structure of micrometer-thick films with variations in the induced uniaxial anisotropy constant with the easy magnetization axis perpendicular to the film surface has been investigated using numerical micromagnetic simulation in the framework of a two-dimensional model of the magnetization distribution. The case where the tetra-axial crystallographic anisotropy exists in the film with uniaxial magnetic anisotropy has been considered. The transformation of the open domain structure into the structure with a magnetic flux closed inside the sample has been investigated in detail, and new types of 109-degree and 90-degree vortex-like domain walls and periodic domain structures have been obtained. © 2013 Pleiades Publishing, Ltd

Generalized Gordon Identities, Hara Theorem and Weak Radiative Hyperon Decays

It is shown that an alternative form of the parity-nonconserving (PNC) transition electromagnetic current resolves partly a puzzle with the Hara theorem. New formulation of it has allowed PNC weak radiative hyperon transitions of the charged hyperons $\Sigma^{+} \Rightarrow p + \gamma$ and $\Xi^{-} \Rightarrow \Sigma^{-} + \gamma$ revealing hitherto unseen transition toroid dipole moment.Comment: LaTex, 7 pages, 2 tables added, text also change

Toroidal quadrupole transitions associated to collective rotational-vibrational motions of the nucleus

In the frame of the algebraic Riemann Rotational Model one computes the longitudinal, transverse and toroidal multipoles corresponding to the excitations of low-lying levels in the ground state band of several even-even nuclei by inelastic electron scattering (e,e'). Related to these transitions a new quantity, which accounts for the deviations from the Siegert theorem, is introduced. The intimate connection between the nuclear vorticity and the dynamic toroidal quadrupole moment is underlined. Inelastic differential cross-sections calculated at backscattering angles shows the dominancy of toroidal form-factors over a broad range of momentum transfer.Comment: 11 pages in LaTex, 3 figures available by fax or mail, accepted for publication in J.Phys.

Form Factors of Composite Systems by Generalized Wigner-Eckart Theorem for Poincar\'e group

The relativistic approach to electroweak properties of two-particle composite systems developed previously is generalized here to the case of nonzero spin. This approach is based on the instant form of relativistic Hamiltonian dynamics. A special mathematical technique is used for the parametrization of matrix elements of electroweak current operators in terms of form factors. The parametrization is a realization of the generalized Wigner--Eckart theorem on the Poincar\'e group, form factors are corresponding reduced matrix elements and they have the sense of distributions (generalized functions). The electroweak current matrix element satisfies the relativistic covariance conditions and in the case of electromagnetic current it also automatically satisfies the conservation law.Comment: Submitted to Theor. Math. Phy

Retrieval of spatio-temporal distributions of particle parameters from multiwavelength lidar measurements using the linear estimation technique and comparison with AERONET

The results of the application of the linear estimation technique to multiwavelength Raman lidar measurements performed during the summer of 2011 in Greenbelt, MD, USA, are presented. We demonstrate that multiwavelength lidars are capable not only of providing vertical profiles of particle properties but also of revealing the spatio-temporal evolution of aerosol features. The nighttime 3β + 1α lidar measurements on 21 and 22 July were inverted to spatio-temporal distributions of particle microphysical parameters, such as volume, number density, effective radius and the complex refractive index. The particle volume and number density show strong variation during the night, while the effective radius remains approximately constant. The real part of the refractive index demonstrates a slight decreasing tendency in a region of enhanced extinction coefficient. The linear estimation retrievals are stable and provide time series of particle parameters as a function of height at 4 min resolution. AERONET observations are compared with multiwavelength lidar retrievals showing good agreement

DYSLIPIDEMIA AS A FACTOR FOR PROGRESSION OF RENAL OSTEODYSTROPHY AND CORONARY HEART DISEASE IN PATIENTS WITH CHRONIC KIDNEY DISEASE ON PERITONEAL DIALYSIS

Numerous studies of the last years focused on various links of pathogenesis and factors for progression of coronary heart disease (CHD) and chronic kidney disease (CKD) allowed to find intersection, such as progression of atherosclerosis or phosphorus and calcium and lipid imbalance, which lead to vascular calcareous infiltration, development of renal osteodystrophy and rising of cardiac risks. Purpose of the research: To define indicators of lipid exchange in patients on peritoneal dialysis which can be factors for progression of renal osteodystrophy and ischemic heart disease. Materials and methods. Indicators of lipid exchange, various types of renal osteodystrophy and clinical types of ischemic heart disease in 114 patients receiving peritoneal dialysis therapy in the Regional Clinical Center of Urology and Nephrology of V.I.Shapoval were analysed. Results. Having analysed changes in blood lipid profile of patients on peritoneal dialysis (PD), we found out a reliable growth of high-density lipoproteins (HDL) in a group of patients without signs of ischemic heart disease and in a group of patients having stable angina, whose primary types of renal osteodystrophy were osteoporosis and fibrous ostitis. Reliable differences had also very-low-density lipoproteins (VLDL) which also were the highest in a group of patients having stable angina without signs of cardiac decompensation. The average duration of PD treatment of patients of this group was 12,3 months. Conclusion. The results of the research confirmed that calcareous infiltration of vessels and heart valves on early stages of PD therapy is mainly caused by dyslipidemia and atherosclerotic changes and less by phosphorus and calcium imbalance which importance increases with duration of PD treatment