Detailed study of dissipative quantum dynamics of K-2 attached to helium nanodroplets

We thoroughly investigate vibrational quantum dynamics of dimers attached to He droplets motivated by recent measurements with K-2 [1]. For those femtosecond pump-probe experiments, crucial observed features are not reproduced by gas phase calculations but agreement is found using a description based on dissipative quantum dynamics, as briefly shown in [2]. Here we present a detailed study of the influence of possible effects induced by the droplet. The helium droplet causes electronic decoherence, shifts of potential surfaces, and relaxation of wave packets in attached dimers. Moreover, a realistic description of (stochastic) desorption of dimers off the droplet needs to be taken into account. Step by step we include and study the importance of these effects in our full quantum calculation. This allows us to reproduce and explain all major experimental findings. We find that desorption is fast and occurs already within 2-10 ps after electronic excitation. A further finding is that slow vibrational motion in the ground state can be considered frictionless.Comment: 17 pages, 5 figure

Instantons and Yang-Mills Flows on Coset Spaces

We consider the Yang-Mills flow equations on a reductive coset space G/H and the Yang-Mills equations on the manifold R x G/H. On nonsymmetric coset spaces G/H one can introduce geometric fluxes identified with the torsion of the spin connection. The condition of G-equivariance imposed on the gauge fields reduces the Yang-Mills equations to phi^4-kink equations on R. Depending on the boundary conditions and torsion, we obtain solutions to the Yang-Mills equations describing instantons, chains of instanton-anti-instanton pairs or modifications of gauge bundles. For Lorentzian signature on R x G/H, dyon-type configurations are constructed as well. We also present explicit solutions to the Yang-Mills flow equations and compare them with the Yang-Mills solutions on R x G/H.Comment: 1+12 page

NbS3_{3}: A unique quasi one-dimensional conductor with three charge density wave transitions

Through transport, compositional and structural studies, we review the features of the charge-density wave (CDW) conductor of NbS$_{3}$ (phase II). We highlight three central results: 1) In addition to the previously reported CDW transitions at $T_{P1}$ = 360\,K and $T_{P2}$ = 150\,K, another CDW transition occurs at a much higher temperature $T_{P0}$ = 620-650\,K; evidence for the non-linear conductivity of this CDW is presented. 2) We show that CDW associated with the $T_{P2}$ - transition arises from S vacancies acting as donors. Such a CDW transition has not been observed before. 3) We show exceptional coherence of the $T_{P1}$-CDW at room-temperature. Additionally, we report on the effects of uniaxial strain on the CDW transition temperatures and transport.Comment: 16 pages, 18 figure

Non-Abelian Vortices, Super-Yang-Mills Theory and Spin(7)-Instantons

We consider a complex vector bundle E endowed with a connection A over the eight-dimensional manifold R^2 x G/H, where G/H = SU(3)/U(1)xU(1) is a homogeneous space provided with a never integrable almost complex structure and a family of SU(3)-structures. We establish an equivalence between G-invariant solutions A of the Spin(7)-instanton equations on R^2 x G/H and general solutions of non-Abelian coupled vortex equations on R^2. These vortices are BPS solitons in a d=4 gauge theory obtained from N=1 supersymmetric Yang-Mills theory in ten dimensions compactified on the coset space G/H with an SU(3)-structure. The novelty of the obtained vortex equations lies in the fact that Higgs fields, defining morphisms of vector bundles over R^2, are not holomorphic in the generic case. Finally, we introduce BPS vortex equations in N=4 super Yang-Mills theory and show that they have the same feature.Comment: 14 pages; v2: typos fixed, published versio

Stent-Graft Treatment of Anterior Interventricular Artery Extravasation Type IIICS: a Clinical Case

Background. Every percutaneous coronary intervention (PCI) is potentially causative of severe surgical accidents. Routine manipulations with catheters, guidewire, delivery systems or stents can damage vascular walls leading to immediate complications like extravasation. In interventional cardiology, ruptures occur in 0.19–0.93% of PCI cases. The endovascular surgeon is to immediately react in case of an accident and decide on further action to  repair the coronary artery rupture.Materials and methods. The article describes a clinical case of a PCI complication, extravasation type IIICS, during a routine stenting of anterior interventricular artery. Stent­grafting at rapture was decided upon conclusive analysis of the situation.Results and discussion. A percutaneous coronary intervention, including routine surgery, potentially poses diverse complications. Extravasation is an expectable complication type. The endovascular surgeon must be sufficiently experienced to decide on an appropriate tactics. The outcome of stent­graft implantation was satisfactory.Conclusion. Stent­graft placement may be a method of choice in a PCI complication of surgery like extravasation type IIICS

Influence of the re-scattering process on polarization observables in reaction gamma + d --> p + p + pi- in Delta - resonance region

Influence of the effects of the pion-nucleon and nucleon-nucleon re-scattering on the polarization observables of the reaction gamma + d = p + p + pi- in Delta - isobar region is investigated. Pion-nucleon and nucleon-nucleon re-scattering are studied in the diagrammatic approach. Relativistic-invariant forms of the pion photoproduction and pion-nucleon scattering operators are used. The unitarization procedure in K-matrix approach is applied for the resonance partial amplitudes. It is shown a considerable influence of the re-scattering effects on the polarization observables of this reaction in the Delta - resonance region for the large momenta of the final protons.Comment: 16 pages, 5 Postscript figure

Prevention of Liver Failure in Extended Hepatic Resection

Background. Postoperative failure is a major cause of adverse outcomes in extensive liver resection. Post-resection liver failure requires intensive, including extracorporeal, care. Issues in correcting liver failure warrant novel approaches to prevent severe cases.Materials and methods. A retrospective analysis of 228 various-extent liver resections included minor (55.7 %), major (26.8 %) and extended (17.5 %) operations for malignant, benign and parasitic liver lesions. The post-resection liver failure rate has ben graded according to ISGLS.Results and discussion. Postoperative hepatic failure developed in 58 (25.4 %) cases, including 5 of 127 minor (3.9 %) resections, 18 major (29.5 %) and 35 of 40 extended resections (87.5 %). Mild class A liver failures were reported in 12.3 %, and severe classes B and C — in 9.2 % and 3.9 % cases, respectively.CT volumetry in place of the number of resected segments is suggested as a criterion to grade the expected post-resection residual liver, with >70 % defining a minor, 36–70 % — major and 25–35 % — extended expected residual liver.A two-staged extended hepatic resection approach is proposed to reduce postoperative liver failure, with vascular radiology-guided right portal vein embolisation (RPVE) or associating liver partition and portal vein ligation (ALPPS) at stage 1.A comparison of extended hepatic resection outcomes (n = 40) showed a significantly higher rate and severity of liver failure in single- vs. two-staged operations (p < 0.05).Conclusion. Liver failure is a leading cause of death in major and extended hepatic resection. Preoperative CT volumetry allows a more accurate volumetric control of expected post-resection residual liver. Two-staged extended hepatic resection can reliably reduce the rate and severity of postoperative liver failure

MODERN TREATMENT MINIMALLY INVASIVE TECHNOLOGIES RENOVASCULAR HYPERTENSION

The purpose of the research was the study of the effectiveness of balloon angioplasty and stenting of renal arteries to improve the microcirculation of the kidneys in patients with renovascular hypertension. During the period from 2010 to 2012 inclusive in the vascular compartment BSMU clinic were examined and treated 32 patients with renal artery stenosis. Inclusion criteria were: presence of verified violations of regional circulation in the kidney, the presence of symptomatic renovascular hypertension. Measures the average systolic and diastolic blood pressure mast. Patients received antihypertensive treatment to endovascular treatment. Treatment with antihypertensive medication was effective only in 9.8 % of cases. Diagnostic angiography of the renal arteries was performed using angiographic complex INNOVA 3131 IQ. After analyzing the data, the question of stenting or balloon angioplasty. After a detailed survey of 32 patients underwent endovascular intervention for renal artery 6 balloon angioplasty and stenting 26. Following the procedure, the hypotensive effect was observed in all cases. Evaluation of the results showed a significant reduction in the maximum rise in systolic blood pressure by 28 %, diastolic - 21 %. After endovascular intervention, the mean systolic blood pressure decreased by 10%, the average diastolic blood pressure - 15 %. Mean arterial pressure decreased by 8 %. In a review of the effectiveness of endovascular procedures with the original length and the degree of hypertension. Thus, roentgenendovascular treatment improves microcirculation in the renal tissue, which leads to the hypotensive effect of a predominantly marked reduction of maximum systolic blood pressure

IMPROVEMENT OF TREATMENT OF UNFORMED DUODENAL AND HIGH JEJUNAL FISTULAS

This article shows many years of surgical experience of treatment of unformed duodenal and high jejunal fistulas using specific combined methods in main treatment group. The review covers the period from 2000 to 2016 years, which includes treatment of 132 patients who suffered from unformed duodenal and high jejunal fistulas. The research was conducted on the basis of the Republic Clinical hospital of G.G. Kuvatov in Bashkortostan. We followed the purpose of analysis and evaluation of the structure and quantity of early postoperative complications, including purulent-septic complications, as well as postoperative lethality, by comparing the main and control groups of treated patients, who received different kinds of therapy of unformed duodenal and jejunal fistulas. The treatment complex (main treatment group) consists of local use of collagen to strengthen intestinal sutures; selective injections of angioprotectors to blood vessels to improve microcirculation and trophic tissues; laser and antibiotic therapy for better eradication of microorganisms. The obtained results showed that the technique developed by us allowed to reduce the frequency of inconsistency of intestinal sutures, the number of newly formed intestinal fistula and purulent-septic complications in the treatment of patients with unformed duodenal and high jejunal fistulas

The GAMMA-400 space observatory: status and perspectives

The present design of the new space observatory GAMMA-400 is presented in this paper. The instrument has been designed for the optimal detection of gamma rays in a broad energy range (from ~100 MeV up to 3 TeV), with excellent angular and energy resolution. The observatory will also allow precise and high statistic studies of the electron component in the cosmic rays up to the multi TeV region, as well as protons and nuclei spectra up to the knee region. The GAMMA-400 observatory will allow to address a broad range of science topics, like search for signatures of dark matter, studies of Galactic and extragalactic gamma-ray sources, Galactic and extragalactic diffuse emission, gamma-ray bursts and charged cosmic rays acceleration and diffusion mechanism up to the knee