Dynamics of the Pionium with the Density Matrix Formalism

The evolution of pionium, the $\pi^+ \pi^-$ hydrogen-like atom, while passing through matter is solved within the density matrix formalism in the first Born approximation. We compare the influence on the pionium break-up probability between the standard probabilistic calculations and the more precise picture of the density matrix formalism accounting for interference effects. We focus our general result in the particular conditions of the DIRAC experiment at CERN.Comment: 14 pages, 2 figures, submitted to J. Phys. B: At. Mol. Phy

Density Matrix Kinetic Equation Describing a Passage of Fast Atomic Systems Through Matter

The quantum-mechanical consideration of a passage of fast dimesoatoms through matter is given. A set of quantum-kinetic equations for the density matrix elements describing their internal state evolution is derived. It is shown that probabilistic description of internal dynamics of hydrogen-like atoms is impossible even at sufficiently low energies because of the ``accidental'' degeneracy of their energy levels.Comment: 12 pages, LATEX, submitted to J. Phys.

THE RESULTS OF TREATMENT CHEMICAL BURNS AND OF POST-BURN CICATRICAL ESOPHAGEAL STRICTURES (LITERATURE REVIEW)

According to different authors, cicatricial changes due to chemical bums of a gullet fluctuate in the big range from 3 to 74 %. Chemical esophagus burn of III degree leads to post-bum scar stricture of the esophagus in 15-70 % of cases. Bougienage, stenting, balloon dilatation are the most effective and safe in 70-96 % of patients. Bougienage is a leading method today. Developing promising direction - stenting with the use of new technologies. Despite the success of minimally invasive surgery in the treatment of stricture, 10-50 % of patients require surgical treatment. For the moment, despite high traumatic and high percent ofstricture relapse (15-40 %), and also exitus letalis coming up to 10%, bougienage is the basic and most effective method of treatment

A Complete Version of the Glauber Theory for Elementary Atom - Target Atom Scattering and Its Approximations

A general formalism of the Glauber theory for elementary atom (EA) - target atom (TA) scattering is developed. A second-order approximation of its complete version is considered in the framework of the optical-model perturbative approach. A `potential' approximation of a second-order optical model is formulated neglecting the excitation effects of the TA. Its accuracy is evaluated within the second-order approximation for the complete version of the Glauber EA-TA scattering theory.Comment: PDFLaTeX, 10 pages, no figures; an updated versio

Direct calculation of the probability of pionium ionization in the target

We performed the first direct calculation of the probability of pionium (pi+pi- atom) ionization in the target. The dependence of the probability of pionium ionization in the target as a function of the pionium lifetime is established. These calculations are of interest of the DIRAC experiment at CERN, which aims to measure the pionium lifetime with high precision.Comment: 11 pages, 4 figures; submitted to "Physics of Atomic Nuclei" ("Yadernaya Fizika"

Prospects of phytopreparations based on Calendula officinalis in complex treatment of chemical burn of the esophagus

Currently worldwide chemical burns of the esophagus rank first among all diseases of the esophagus in children and second in adults. Because of commonly accepted algorithms of rendering of medical aid in case of chemical burns of the esophagus in the prehospital and hospital stages (washing of the esophagus and the stomach, adequate anesthesia, corticosteroid, antibiotic therapy, the group of antacids and symptomatic treatment), the choice of drug and method of local impact on the surface of chemical burn of the esophagus remain an urgent problem. The lack of standardized approach in treatment of local changes in chemical burns of the esophagus, severe and unsatisfactory results of using medication algorithms inspire a search for alternative methods of treatment and drug development. Herbal remedies are comparable in effectiveness, but also have the combined multivalent effect on the entire body, causing minimum of side effects. Basing on the literature review, we have come to a conclusion that the most balanced composition of biologically active substances and a positive influence on the basic pathogenesis of esophageal chemical burns has Calendula officinalis. Features and scope of Calendula officinalis are not fully understood. The creation of a multidrug for the local treatment chemical burns of the esophagus based on this herb proves to be very promising

The electromagnetic effects in Ke4K_{e4} decay

The final state interaction of pions in $K_{e4}$ decay allows one to obtain the value of the isospin and angular momentum zero $\pi\pi$ scattering length $a_0^0$.We take into account the electromagnetic interaction of pions and isospin symmetry breaking effects caused by different masses of neutral and charged pions and estimate the impact of these effects on the procedure of scattering length extraction from $K_{e4}$ decay.Comment: 8 pages,1 figur

The isospin symmetry breaking effects in Ke4K_{e4} decays

The Fermi-Watson theorem is generalized to the case of two coupled channels with different masses and applied to final state interaction in $K_{e4}$ decays. The impact of considered effect on the phase of the $\pi\pi$ scattering is estimated and shown that it can be crucial for scattering lengths extraction from experimental data on $K_{e4}$ decays

Determination of ππ\pi\pi scattering lengths from measurement of π+π−\pi^+\pi^- atom lifetime

The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ has been attained, providing an important test of Chiral Perturbation Theory.Comment: 6 pages, 6 figure

Исследование процессов перекисного окисления липидов в хрусталике и тканях при экспериментальном холестериновом атеросклерозе.

Одной из моделей экспериментальной катаракты, является модель холестеринового атеросклероза. Исследование липидного и перекисного обменов, активности антиоксидантных ферментов у кроликов с холестериновым атеросклерозом показало, что введение животным холестерина вызвало активацию процессов свободно-радикального окисления в хрусталике и тканях. Данная модель может быть использована в исследовании и разработке средств ингибирующих катарактогенез; One of models of experimental cataracts is the model of cholesteric atherosclerosis. Research of lipid and peroxide metabolism of antioxidant enzymes and rabbits with cholesterol atherosclerosis showed that the administration of cholesterol to animals caused activation of free radical oxidation processes in the lens and tissues. This model can be used in the research and development of cataractogenesis inhibitory drugs