Low-temperature kinetics of exciton-exciton annihilation of weakly localized one-dimensional Frenkel excitons

We present results of numerical simulations of the kinetics of exciton-exciton annihilation of weakly localized one-dimensional Frenkel excitons at low temperatures. We find that the kinetics is represented by two well-distinguished components: a fast short-time decay and a very slow long-time tail. The former arises from excitons that initially reside in states belonging to the same localization segment of the chain, while the slow component is caused by excitons created on different localization segments. We show that the usual bi-molecular theory fails in the description of the behavior found. We also present a qualitative analytical explanation of the non-exponential behavior observed in both the short- and the long-time decay components.Comment: Published in J. Chem. Phys. 114, 1 April (2001

Интрамиокардиальная трансплантация аутологичных прогениторных клеток периферической крови в комплексном лечении больных с ишемической кардиомиопатией

During the follow up there was noticed that the maximum effect of intramyocardial transplantation develoed after 6 months after the transplantation. LVEF increased by an average by (6±3)% and improvement of local and global contractility observed. After 18 months-follow-up increasing of survival was noticed.Перспективной является идея интрамиокардиальной трансплантации аутологичных прогениторных клеток периферической крови пациентам с ишемической кардиомиопатией (ИКМП), которые исчерпали возможности стандартных методов лечения. Пациенты с установленным диагнозом ИКМП были разделены на две группы. В группе 1 (n=29) проводилась интрамиокардиальная трансплантация аутологичных прогениторных клеток периферической крови в комбинации с оптимальной медикаментозной терапией. В группе 2 (n=31) назначалась только оптимальная медикаментозная терапия. Во время контрольных обследований отмечено, что максимальный эффект от трансплантации развивался через 6 мес. после процедуры. Фракция выброса левого желудочка (ЛЖ) увеличилась в среднем на (6±3) %, улучшилась локальная и глобальная сократимость миокарда ЛЖ. Через 18 мес. отмечено увеличение выживаемости в группе, где проводилась трансплантация

Reactor as a Source of Antineutrinos: Thermal Fission Energy

Deeper insight into the features of a reactor as a source of antineutrinos is required for making further advances in studying the fundamental properties of the neutrino. The relationship between the thermal power of a reactor and the rate of the chain fission reaction in its core is analyzed.Comment: 15 pages in LaTex and 4 ps figure

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

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