Enhancement of the electric dipole moment of the electron in BaF molecule

We report results of ab initio calculation of the spin-rotational Hamiltonian parameters including P- and P,T-odd terms for the BaF molecule. The ground state wave function of BaF molecule is found with the help of the Relativistic Effective Core Potential method followed by the restoration of molecular four-component spinors in the core region of barium in the framework of a non-variational procedure. Core polarization effects are included with the help of the atomic Many Body Perturbation Theory for Barium atom. For the hyperfine constants the accuracy of this method is about 5-10%.Comment: 8 pages, REVTEX, report at II International Symposium on Symmetries in Subatomic Physics, Seattle 199

Influence of AC electric field on the charge generation in albumin solution in a flow-based AFM-fishing system

The work was supported by the Russian Ministry of Education and Science, Agreement No. 14.613.21.0063, universal identifier RFMEFI61317X0063

Spin noise of a halide perovskite

We report on first observation of spin noise in a strongly birefringent semiconductor -- halide perovskite single crystal MAPbI$_3$. The observed spin noise resonance is ascribed to free holes with a record spin dephasing time of 4 ns. The spin dynamics is found to be affected by the residual light absorption of the crystal providing renormalization of the Larmor frequency. Extended spin noise spectroscopy with rotating magnetic field allowed us not only to evaluate the $g$-factor anisotropy, but also to distinguish two different spin subsystems tentatively associated to twinning of the crystal.Comment: 14 pages, 11 figure

The half-life of 221^{221}Fr in Si and Au at 4K and at mK temperatures

The half-life of the $\alpha$ decaying nucleus $^{221}$Fr was determined in different environments, i.e. embedded in Si at 4 K, and embedded in Au at 4 K and about 20 mK. No differences in half-life for these different conditions were observed within 0.1%. Furthermore, we quote a new value for the absolute half-life of $^{221}$Fr of t$_{1/2}$ = 286.1(10) s, which is of comparable precision to the most precise value available in literature

Role of dihydropyridine calcium channel blockers in coronary bypass surgery using the radial artery graft

Aim. To assess the effect of a pharmacological protocol for the prevention of radial artery spasm, which is based on the systemic and local use of dihydropyridine calcium channel blockers, on the long-term outcomes of autoarterial coronary artery bypass grafting.Material and methods. According to the protocol, oral nifedipine at a dose of 5 mg/day is prescribed 3 days before surgery. Then, after the radial artery is isolated, the vessel is preserved in a solution of nifedipine (adalat) until it is used. After releasing the clamp from the aorta, a nifedipine (adalat) is infused intravenously at a dose of 0,63 mg/h. In the postoperative period, the infusion of nifedipine continues for 6 hours. In the future, patients are recommended to take dihydropyridine calcium channel blockers at a dose of 5 mg/day after discharge from the hospital.Results. The use of the pharmacological protocol (n=225) is associated with a lower number of major cardiovascular events (mortality, myocardial infarction, stroke) compared with the control group (n=230) (9,3% and 15,7%, p=0,031) during the 5-year follow-up. This result was achieved mainly by reducing the incidence of myocardial infarction (6,2% and 12,6%, p=0,018). Also, the use of the pharmacological protocol led to a decrease in repeated revascularizations (4,4% and 16,1%, p=0,0001) compared with the control group.Conclusion. The use of a pharmacological protocol for the prevention of radial artery spasm based on the systemic use of dihydropyridine calcium channel blockers improves the long-term outcomes of autoarterial coronary artery bypass grafting

Transport of magnetoexcitons in single and coupled quantum wells

The transport relaxation time $\tau (P)$ and the mean free path of magnetoexcitons in single and coupled quantum wells are calculated ($P$ is the magnetic momentum of the magnetoexciton). We present the results for magnetoexciton scattering in a random field due to (i) quantum well width fluctuations, (ii) composite fluctuations and (iii) ionized impurities. The time $\tau(P)$ depends nonmonotonously on $P$ in the case (ii) and in the cases (i), (iii) for $D/l$ smaller than some critical value ($D$ is the interwell separation, $l=\sqrt{\hbar c/eH}$ is the magnetic length). For $D/l\gg 1$ the transport relaxation time increases monotonously with $P$. The magnetoexciton mean free path $\lambda (P)$ has a maximum at $P\ne 0$ in the cases (i), (iii). It decreases with increasing $D/l$. The mean free path calculated for the case (ii) may have two maxima. One of them disappears with the variation of the random fields parameters. The maximum of $\lambda (P)$ increases with $H$ for types (i,iii) of scattering processes and decreases in the case (ii).Comment: 13 pages, 8 figures in EPS format; Physica Scripta (in print

Discrete Nonholonomic LL Systems on Lie Groups

This paper applies the recently developed theory of discrete nonholonomic mechanics to the study of discrete nonholonomic left-invariant dynamics on Lie groups. The theory is illustrated with the discrete versions of two classical nonholonomic systems, the Suslov top and the Chaplygin sleigh. The preservation of the reduced energy by the discrete flow is observed and the discrete momentum conservation is discussed.Comment: 32 pages, 13 figure