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Search Results: 1 - 10 of 231 matches for " Dmytro Kundys "
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Phase-controlled integrated photonic quantum circuits
Brian J. Smith,Dmytro Kundys,Nicholas Thomas-Peter,P. G. R. Smith,I. A. Walmsley
Physics , 2009, DOI: 10.1364/OE.17.013516
Abstract: Scalable photonic quantum technologies are based on multiple nested interferometers. To realize this architecture, integrated optical structures are needed to ensure stable, controllable, and repeatable operation. Here we show a key proof-of-principle demonstration of an externally-controlled photonic quantum circuit based upon UV-written waveguide technology. In particular, we present non-classical interference of photon pairs in a Mach-Zehnder interferometer constructed with X couplers in an integrated optical circuit with a thermo-optic phase shifter in one of the interferometer arms.
Photostrictive materials
B. Kundys
Physics , 2015, DOI: 10.1063/1.4905505
Abstract: Light-matter interactions that lead to nonthermal changes in size of the sample constitute a photostrictive effect in many compounds. The photostriction phenomenon was observed in four main groups of materials, ferroelectrics, polar, and non-polar semiconductors, as well as in organic-based materials that are reviewed here. The key mechanisms of photostriction and its dependence on several parameters and perturbations are assessed. The major literature of the photostriction is surveyed, and the review ends with a summary of the proposed technical applications.
Analysis of Dynamics of Boundary Shape Perturbation of a Rotating Elastoplastic Radially Inhomogeneous Plane Circular Disk: Analytical Approach  [PDF]
Dmytro М. Lila, А. А. Martynyuk
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.35068
Abstract: For a rotating inhomogeneous circular disk a way of calculating dynamics of boundary shape perturbation and failure of bearing capacity is proposed in terms of small parameter method. Characteristic equation of plastic zone critical radius is obtained as a first approximation. A formula of critical angular velocity is derived which determines the stability loss of the disc according to the self-balanced form. Efficiency of the proposed method is shown by an illustrative example considered in Section 7. Values of critical angular velocity of rotation are found numerically for different parameters of the disc.
Estudos s?bre Longicórneos Neotrópicos (Coleoptera, Cerambycidae)
Zajciw, Dmytro;
Memórias do Instituto Oswaldo Cruz , 1958, DOI: 10.1590/S0074-02761958000200014
Abstract: in this paper, based on the study of the materials of the collections belonging to dr. c. a. campos seabra and the author's own, the author gives the additional characters of the rare species volxemia dianella lam., sthelenus braconimus bates and sth. ichneumoneus buq., the redescription of the genus xenocrasis bates, the descriptions of allotypes of the males of brasilianus testaceicornis melz., xenocrasis badeni bates and oncideres castanea dill. & dill., and the key for the determination of the species colobothea serv. with 6 (8) pale spots on the elytra. all these species are from brazil.
Novos longicórneos neotrópicos: XIII. (Col., Cerambycidae, Cerambycinae)
Zajciw, Dmytro;
Memórias do Instituto Oswaldo Cruz , 1967, DOI: 10.1590/S0074-02761967000200006
Abstract: the author describes one new genus, dihammaphoroides allied to dihammaphora chevr., 1859 and tree new species: coleoxestia omega, approximate to bivittata (buq., 1852), ommata (eclipta) melzeri resembling castanea bat., 1873 and dihammaphoroides sanguinicollis, all from brazil, prov. rio de janeiro, national park itatiaia, collected by j. f. zikan.
Dmytro Myeshkov
Magister Dixit , 2012,
Abstract: The article deals with the history of the Soviet policy in manpower management in the first two post-war decades on an example of two Russian regions – Sverdlovsk region and Stavropol Krai. The purpose is to analyze the problem of provision agriculture with qualified personnel during de-Stalinization of public life of able-bodied population migration, including mass migrations of rural youth to the cities. In the 1950th – the beginning of the 1960th country leaders undertook measures for regulation of labor migrations. Thus the new methods gradually come to change to mobilization character of policy in relation to manpower reserves, urged to raise appeal of agricultural work and quality of the village life. Not only party and state authorities, but also local writers, and also local mass media were involved in this work.
Formation of a Tunnel under the Major Hepatic Vein Mouths during Removal of IVC Tumor Thrombus
Dmytro Shchukin
Case Reports in Urology , 2013, DOI: 10.1155/2013/129632
Abstract: This study describes a clinical observation of successful implementation of a new surgical maneuver: formation of a cross tunnel under the mouths of the major hepatic veins during removal of a tumor thrombus of the inferior vena cava. This surgical technique helps avoid the usage of ? “piggyback” mobilization of the liver and the complications associated with it. However, for objective evaluation of this approach, a further clinical study is required. 1. Introduction Obvious limitations of high tumor thrombus removal with the use of balloon catheters or cardiopulmonary bypass have determined the development of alternative methods making it possible to fully control subhepatic, retrohepatic, and intrapericardial segments of the inferior vena cava (IVC) [1, 2]. The most important aspect of this approach is feasibility of external digital displacement of the thrombus apex below the diaphragm [3, 4]. However, due to the weakness of caval collateral vessel development, the clamping of the IVC above the mouths of the major hepatic veins can cause serious hemodynamic changes. Therefore, the main task of a surgeon in such a situation is to further displace the thrombus downwards and clamp the IVC below the mouths of the major hepatic veins [3, 4]. This maneuver was proposed by Ciancio et al. and now is used by many surgeons worldwide. It helps maintain hepatic blood flow, which accounts for about 25% of blood flow to the inferior vena cava. The main condition for the implementation of this stage of the operation is to carry out the mobilization of the liver using the classical and “piggyback” variants. But we should be aware that due to the problems associated with the venous anatomy, “piggyback” liver mobilization is possible only in 80%–92% of cases [5, 6]. This study presents a clinical observation of removal of a high tumor thrombus of the IVC with the use of a surgical technique, which involves forming a cross tunnel under the mouths of the major hepatic veins without “piggyback” mobilization of the liver. 2. Case Presentation A 57-year-old man was admitted to the hospital with complaints of gross hematuria and general weakness. Examination revealed a left kidney tumor, 150?mm 120?mm in size, extending up to the intrapericardial segment of the inferior vena cava (Figure 1). Distant and regional metastases were not found. Ultrasonography demonstrated thrombus apex flotation, which suggested the absence of adhesions of intraluminal tumor to the vena cava endothelium. Figure 1: MSCT images of supradiaphragmatic IVC tumor thrombus ((a) frontal reconstruction
From the mass gap in O(N) to the non-Borel-summability in O(3) and O(4) sigma-models
Dmytro Volin
Physics , 2009, DOI: 10.1103/PhysRevD.81.105008
Abstract: We give an analytical derivation of the mass gap of the O(N) sigma models and investigate a large-order behavior of the weak coupling asymptotic expansion for the energy. For sufficiently large N the series is sign-oscillating, which is expected from the large N solution of the sigma model. However, for N=3 and N=4 the series are sign positive.
Development of electromagnetic calorimeter detectors and simulations for spectroscopic measurements of charmonium with PANDA
Dmytro Melnychuk
Physics , 2010,
Abstract: The subject of the thesis is the study of electromagnetic transitions in charmonium with PANDA. The possible registration of the $h_c$ state in charmonium, observed recently by the E760 and E835 Fermilab experiments, is used for demonstration of the physics performance of the PANDA detector. The measurement of the angular distribution of $\gamma$-rays from radiative transitions can be used for the verification of its $J^{PC}$ quantum numbers. The electromagnetic calorimeter of the PANDA detector is the crucial component for this studies from the point of view of signal registration and background suppression.
Quantum integrability and functional equations
Dmytro Volin
Physics , 2010, DOI: 10.1088/1751-8113/44/12/124003
Abstract: In this thesis a general procedure to represent the integral Bethe Ansatz equations in the form of the Reimann-Hilbert problem is given. This allows us to study in simple way integrable spin chains in the thermodynamic limit. Based on the functional equations we give the procedure that allows finding the subleading orders in the solution of various integral equations solved to the leading order by the Wiener-Hopf technics. The integral equations are studied in the context of the AdS/CFT correspondence, where their solution allows verification of the integrability conjecture up to two loops of the strong coupling expansion. In the context of the two-dimensional sigma models we analyze the large-order behavior of the asymptotic perturbative expansion. Obtained experience with the functional representation of the integral equations allowed us also to solve explicitly the crossing equations that appear in the AdS/CFT spectral problem.
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