Contribution of α2\alpha^2-terms to the total interaction cross sections of relativistic elementary atoms with atoms of matter

It is shown that the corrections of $\alpha^2$ order to the total cross sections for interaction of elementary hydrogen-like atoms with target atoms, reported in the previously published paper [S.Mrowczynski, Phys.Rev. D36, 1520 (1987)], do not include some terms of the same order of magnitude. That results in a significant contribution of these corrections in particular cases. The full $\alpha^2$-corrections have been derived and it is shown that they are really small and could be omitted for most practical applications.Comment: 5 page

Modern approaches to the treatment of genital prolapse in obese women

Introduction. The problem of female genital prolapse (GP) remains in the sportlight of gynecologists, because despite the variety of surgical methods, there are still recurrences of the disease, which are associated not only with the failure of the restored ligaments, fascia, muscles, damaged pelvic floor and perineum, but with the imperfection of the operation. The solution of this problem is especially important in the treatment of patients with extragenital pathology, in particular obesity. The purpose: to optimize the treatment of genital prolapse in obese patients by determining an individual approach to planning surgical treatment taking into account the degree of obesity and concomitant pathology. Materials and methods. We examined 65 patients of which 20 had genital prolapse and obesity (main group), 25 had genital prolapse and normal weight (comparison group), 20 women did not have gynecological diseases and extragenital pathology made up control group. To diagnose obesity and determine its degree we calculated body mass index (BMI). To determine the degree of GP its quantitative assessment was used (POP-Q; 1996). Surgical intervention included transvaginal extirpation of the uterus without appendages, anterior colporrhaphy, colpoperineoraphy with levatoplasty, sacrospinal colpopexy. Transabdominal and laparoscopic colposacropexy in obese women were not used due to the presence of relative contraindications for laparoscopy (cardiovascular disease, respiratory pathology, adhesions, the condition after hernias’ surgery). Therefore, all operations on women with GP and obesity were performed transvaginally due to the inability to perform abdominal access. In comparison group transvaginal surgery was performed. All the groups under study were representative. Before the use of polypropylene mesh "Polymesh" to minimize purulent-septic complications associated with the use of synthetic prostheses aquadissection was performed with 0.9% saline with the addition of 1 g of ceftriaxone per 200 ml. After the operation, the women used suppositories with hyaluronic acid (revitax). Results. The results of surgical treatment have been analyzed and the following data were obtained: recurrences in the main and in the comparison group were 4% (2 women in whom operations were performed with the use of their own tissues without  mesh prosthesis). Infectious complications, dyspareunia and pelvic pain were not observed. Conclusions. Surgical treatment of GP in obese women by using polypropylene mesh "Polymesh" for colposacropexy after transvaginal uterine extirpation increases the effectiveness of treatment  and redduces the number of recurrences. Hydropreparation of the mesh with an antibacterial agent and postoperative use of hyaluronidase intravaginally helps to reduce purulent-septic complications of surgery and improves the patients’quality of life

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.

Mobile Data Repositories at the Edge.

In a future IoT-dominated environment the majority of data will be produced at the edge, which may be moved to the network core. We argue that this reverses today’s “core-to-edge” data flow to an “edge-to-core” model and puts severe stress on edge access/cellular links. In this paper, we propose a data-centric communication approach which treats storage and wire the same as far as their ability to supply the requested data is concerned. Given that storage is cheaper to provide and scales better than wires, we argue for enhancing network connectivity with local storage services (e.g., in WiFi Access Points, or similar) at the edge of the network. Such local storage services can be used to buffer IoT and user-generated data at the edge, prior to data-cloud synchronization

On the Possibility of Using Succinate in Hypoxia Developing in COVID-19

Aim. To provide a rationale for the feasibility of using the succinate-containing drugs to treat hypoxia associated with COVID-19 based on the analysis of experimental and clinical studies.Materials and methods. 84 Russian and international literature sources concerning the pathogenesis of COVID-19 and the pathogenetic role of succinate in the management of COVID-19 associated hypoxia, oxidative stress and diaphragmatic dysfunction were analyzed. The literature search was performed using Pubmed and ELIBRARY.ru databases.Results. The literature analysis showed that tissue hypoxia, triggering the pathomorphological cascade of events and resulting in multiple organ failure is a central element of COVID-19 pathogenesis. Experimental and clinical studies show the positive impact of tissue hypoxia correction using succinate in both adult patients and children with various conditions associated with acute respiratory failure.Conclusion. The literature data provide a rationale for using succinate-containing drugs in the treatment of severe COVID-19

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

Coronal Shock Waves, EUV Waves, and Their Relation to CMEs. III. Shock-Associated CME/EUV Wave in an Event with a Two-Component EUV Transient

On 17 January 2010, STEREO-B observed in extreme ultraviolet (EUV) and white light a large-scale dome-shaped expanding coronal transient with perfectly connected off-limb and on-disk signatures. Veronig et al. (2010, ApJL 716, 57) concluded that the dome was formed by a weak shock wave. We have revealed two EUV components, one of which corresponded to this transient. All of its properties found from EUV, white light, and a metric type II burst match expectations for a freely expanding coronal shock wave including correspondence to the fast-mode speed distribution, while the transient sweeping over the solar surface had a speed typical of EUV waves. The shock wave was presumably excited by an abrupt filament eruption. Both a weak shock approximation and a power-law fit match kinematics of the transient near the Sun. Moreover, the power-law fit matches expansion of the CME leading edge up to 24 solar radii. The second, quasi-stationary EUV component near the dimming was presumably associated with a stretched CME structure; no indications of opening magnetic fields have been detected far from the eruption region.Comment: 18 pages, 10 figures. Solar Physics, published online. The final publication is available at http://www.springerlink.co

First measurement of the π+π−\pi^+\pi^- atom lifetime

The goal of the DIRAC experiment at CERN (PS212) is to measure the $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based on part of the collected data we present a first result on the lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss the major systematic errors. This lifetime corresponds to $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.Comment: 18 pages, 6 figure

Coronal Shock Waves, EUV waves, and Their Relation to CMEs. I. Reconciliation of "EIT waves", Type II Radio Bursts, and Leading Edges of CMEs

We show examples of excitation of coronal waves by flare-related abrupt eruptions of magnetic rope structures. The waves presumably rapidly steepened into shocks and freely propagated afterwards like decelerating blast waves that showed up as Moreton waves and EUV waves. We propose a simple quantitative description for such shock waves to reconcile their observed propagation with drift rates of metric type II bursts and kinematics of leading edges of coronal mass ejections (CMEs). Taking account of different plasma density falloffs for propagation of a wave up and along the solar surface, we demonstrate a close correspondence between drift rates of type II bursts and speeds of EUV waves, Moreton waves, and CMEs observed in a few known events.Comment: 30 pages, 15 figures. Solar Physics, published online. The final publication is available at http://www.springerlink.co