Resonances in Exotic 7^7He Nucleus within the No-Core Shell Model

We present ab initio calculations of resonances for $^7$He, a nucleus with no bound states, using the realistic nucleon-nucleon interaction Daejeon16. For this, we evaluate the $n{-}{^6\rm He}$ elastic scattering phase shifts obtained within an $S$-matrix analysis of no-core shell model results for states in the continuum. We predict new broad resonances likely related to fragmentary experimental evidence.Comment: 6 pages, 3 figure

SS-HORSE Extension of the No-Core Shell Model: Application to Resonances in 7He^7{\mathrm He}

Theoretical ab initio studies of resonances in the unbound ${\rm^{7}He}$ nucleus are presented. We perform no-core shell model calculations with $NN$ interactions Daejeon16 and JISP16 and utilize the SS-HORSE method to calculate the $S$ matrix for two-body channels $n{-}{\rm^{6}He}$ and $n{-}{\rm^{6}He^{*}}$ with ${\rm^{6}He}$ respectively in the ground and excited $2^{+}$ states as well as for the four-body democratic decay channel ${{\rm^{4}He}+n+n+n}$. The resonant energies and widths areobtained by numerical location of the $S$-matrix poles. We describe all experimentally known ${\rm^{7}He}$ resonances and suggest an interpretation of an observed wide resonance of unknown spin-parity.Comment: 10 pages, 2 figure

Stochastic theory of ferroelectric domain structure formation dominated by quenched disorder

A self-consistent stochastic model of domain structure formation in a uniaxial ferroelectric, quenched from a high-temperature paraelectric phase to a low-temperature ferroelectric phase, is developed with an account of the applied electric field and the feedback effect via local depolarization fields. Both polarization and field components are considered as Gauss random variables. A system of integro-differential equations for correlation functions of all involved variables is derived and solved analytically and numerically. Phase diagram in terms of the average value and dispersion of polarization reveals different possible equilibrium states and available final single-domain and multi-domain states. The time-dependent evolution of the average polarization and dispersion discloses a bifurcation behavior and the temperature-dependent value of the electric field, deciding between the single-domain and multi-domain final states, which can be interpreted as the coercive field. Analytical and numerical results for the time-dependent correlation length and correlation functions exhibit plausible agreement with available experimental data.Comment: 33 pages, 10 figure

ВИКОРИСТАННЯ ПОТЕНЦІАЛУ ПРАКТИЧНОЇ ОХОРОНИ ЗДОРОВ’Я У ПІДГОТОВЦІ СУЧАСНОГО СПЕЦІАЛІСТА

The article adduces the main principles of students’ practical training organisation of Kremenets Medical College by Arsen Richynskyi, that are based on close cooperation of teachers and doctors. This cooperation provides a student with a complete picture about the future profession, helps to form professional, social and psychological competencies that are necessary for self-improvement and selfaffirmation in society.У статті висвітлено основні засади організації практичного тренування студентів Кременецького медичного училища імені Арсена Річинського, що основані на тісній співпраці викладачів училища та працівників практичної охорони здоров’я. Така співпраця дає студенту можливість отримати повне уявлення про майбутню професію, сформувати професійні, соціальні і психологічні компетенції, які необхідні для самореалізації, самовдосконалення і самоствердження в суспільстві

A Quantum Mechanical Model of the Reissner-Nordstrom Black Hole

We consider a Hamiltonian quantum theory of spherically symmetric, asymptotically flat electrovacuum spacetimes. The physical phase space of such spacetimes is spanned by the mass and the charge parameters $M$ and $Q$ of the Reissner-Nordstr\"{o}m black hole, together with the corresponding canonical momenta. In this four-dimensional phase space, we perform a canonical transformation such that the resulting configuration variables describe the dynamical properties of Reissner-Nordstr\"{o}m black holes in a natural manner. The classical Hamiltonian written in terms of these variables and their conjugate momenta is replaced by the corresponding self-adjoint Hamiltonian operator, and an eigenvalue equation for the ADM mass of the hole, from the point of view of a distant observer at rest, is obtained. Our eigenvalue equation implies that the ADM mass and the electric charge spectra of the hole are discrete, and the mass spectrum is bounded below. Moreover, the spectrum of the quantity $M^2-Q^2$ is strictly positive when an appropriate self-adjoint extension is chosen. The WKB analysis yields the result that the large eigenvalues of the quantity $\sqrt{M^2-Q^2}$ are of the form $\sqrt{2n}$, where $n$ is an integer. It turns out that this result is closely related to Bekenstein's proposal on the discrete horizon area spectrum of black holes.Comment: 37 pages, Plain TeX, no figure

Cosmological Dark Energy: Prospects for a Dynamical Theory

We present an approach to the problem of vacuum energy in cosmology, based on dynamical screening of Lambda on the horizon scale. We review first the physical basis of vacuum energy as a phenomenon connected with macroscopic boundary conditions, and the origin of the idea of its screening by particle creation and vacuum polarization effects. We discuss next the relevance of the quantum trace anomaly to this issue. The trace anomaly implies additional terms in the low energy effective theory of gravity, which amounts to a non-trivial modification of the classical Einstein theory, fully consistent with the Equivalence Principle. We show that the new dynamical degrees of freedom the anomaly contains provide a natural mechanism for relaxing Lambda to zero on cosmological scales. We consider possible signatures of the restoration of conformal invariance predicted by the fluctuations of these new scalar degrees of freedom on the spectrum and statistics of the CMB, in light of the latest bounds from WMAP. Finally we assess the prospects for a new cosmological model in which the dark energy adjusts itself dynamically to the cosmological horizon boundary, and therefore remains naturally of order H^2 at all times without fine tuning.Comment: 50 pages, Invited Contribution to New Journal of Physics Focus Issue on Dark Energ

РОЛЬ НАУКОВО-ДОСЛІДНОЇ РОБОТИ В ПРАКТИЧНОМУ НАВЧАННІ СТУДЕНТІВ

The article adduces the methods of scientific research of medical school students. The students get the previous specialization of professional preparation carrying the research work out.У статті обгрунтовано важливість та подано методи проведення науково-дослідної роботи студентів медичного училища. Проводячи пошуково-дослідну роботу, студенти отримують попередню соціалізацію фахової підготовки, активно готуються до майбутньої професійної діяльності

Aharonov-Bohm interference in quantum ring exciton: effects of built-in electric fields

We report a comprehensive discussion of quantum interference effects due to the finite structure of excitons in quantum rings and their first experimental corroboration observed in the optical recombinations. Anomalous features that appear in the experiments are analyzed according to theoretical models that describe the modulation of the interference pattern by temperature and built-in electric fields.Comment: 6 pages, 7 figure

ОСОБЛИВОСТІ ПІДГОТОВКИ МОЛОДШИХ МЕДИЧНИХ СПЕЦІАЛІСТІВ З ПРЕДМЕТА «МЕДИЦИНА КАТАСТРОФ» ЗА ФАХОМ «СЕСТРИНСЬКА СПРАВА»

The article adduces the necessity and expedience of studying the discipline «Medicine of catastrophes» on the prediploma stage of gunior medical and specialist's training the experience of teaching of this discipline at the nursing department of Kremenets Medical School by Arsen Richynskyi.У статті обгрунтовано необхідність та доцільність вивчення дисципліни «Медицина катастроф» на IV курсі підготовки молодшого медичного персоналу та наведено досвід викладання цієї дисципліни на сестринському відділенні Кременецького медичного училища імені Арсена Річинського