Pionic Decay of a Possible d'-Dibaryon

The pionic decay of a possible d'-dibaryon in the process d' --> pi + N + N is studied in the microscopic quark shell model and with a single-quark transition operator describing the transition q --> pi + q'. For the d' with quantum numbers J^P=0^-, T=0, we employ a six-quark shell-model wave function with a spatial s^5p [51]_X-configuration with N=1 harmonic oscillator quanta. It is shown that the pionic decay width depends strongly on the mass and size of the d'. In the case that the calculated d' mass is close to the experimental one a small pionic decay width of 0.04 MeV is obtained. This is an order of magnitude smaller than the experimentally suggested value of 0.5 MeV. Two possibilities to improve the calculated width are suggested. The effect of the nonstatic correction term in the transition operator and the influence of the form factor at the decay vertex on the decay width are also discussed.Comment: Latex, 15 pages, 1 postscript figure, accepted for publication in Nucl. Phys.

Rational solutions of the discrete time Toda lattice and the alternate discrete Painleve II equation

The Yablonskii-Vorob'ev polynomials $y_{n}(t)$, which are defined by a second order bilinear differential-difference equation, provide rational solutions of the Toda lattice. They are also polynomial tau-functions for the rational solutions of the second Painlev\'{e} equation ($P_{II}$). Here we define two-variable polynomials $Y_{n}(t,h)$ on a lattice with spacing $h$, by considering rational solutions of the discrete time Toda lattice as introduced by Suris. These polynomials are shown to have many properties that are analogous to those of the Yablonskii-Vorob'ev polynomials, to which they reduce when $h=0$. They also provide rational solutions for a particular discretisation of $P_{II}$, namely the so called {\it alternate discrete} $P_{II}$, and this connection leads to an expression in terms of the Umemura polynomials for the third Painlev\'{e} equation ($P_{III}$). It is shown that B\"{a}cklund transformation for the alternate discrete Painlev\'{e} equation is a symplectic map, and the shift in time is also symplectic. Finally we present a Lax pair for the alternate discrete $P_{II}$, which recovers Jimbo and Miwa's Lax pair for $P_{II}$ in the continuum limit $h\to 0$.Comment: 23 pages, IOP style. Title changed, and connection with Umemura polynomials adde

The Hamiltonian Structure of the Second Painleve Hierarchy

In this paper we study the Hamiltonian structure of the second Painleve hierarchy, an infinite sequence of nonlinear ordinary differential equations containing PII as its simplest equation. The n-th element of the hierarchy is a non linear ODE of order 2n in the independent variable $z$ depending on n parameters denoted by ${t}_1,...,{t}_{n-1}$ and $\alpha_n$. We introduce new canonical coordinates and obtain Hamiltonians for the $z$ and $t_1,...,t_{n-1}$ evolutions. We give explicit formulae for these Hamiltonians showing that they are polynomials in our canonical coordinates

Magneto-gyrotropic effects in semiconductor quantum wells (review)

Magneto-gyrotropic photogalvanic effects in quantum wells are reviewed. We discuss experimental data, results of phenomenological analysis and microscopic models of these effects. The current flow is driven by spin-dependent scattering in low-dimensional structures gyrotropic media resulted in asymmetry of photoexcitation and relaxation processes. Several applications of the effects are also considered.Comment: 28 pages, 13 figure

Gravitational Couplings of Intrinsic Spin

The gravitational couplings of intrinsic spin are briefly reviewed. A consequence of the Dirac equation in the exterior gravitational field of a rotating mass is considered in detail, namely, the difference in the energy of a spin-1/2 particle polarized vertically up and down near the surface of a rotating body is $\hbar\Omega\sin\theta$. Here $\theta$ is the latitude and $\Omega = 2GJ/(c^2 R^3)$, where $J$ and $R$ are, respectively, the angular momentum and radius of the body. It seems that this relativistic quantum gravitational effect could be measurable in the foreseeable future.Comment: LaTeX file, no figures, 16 page

Влияние короткого курса терапии мовалисом на качество жизни пациентов с остеоартрозом

Tsel' issledovaniya. Otsenivali vliyanie korotkogo kursa terapii movalisom na kachestvo zhizni patsientov s osteoartrozom. Materialy i metody. Dlya opredeleniya kachestva zhizni bol'nykh ispol'zovalsya obshchiy oprosnik EQ-5D. V techenie 10 dney patsienty poluchali nesteroidnyy protivovospalitel'nyy preparat movalis, provodilas' takzhe terapiya soputstvuyushchikh zabolevaniy. Anketu kachestva zhizni EQ-5D bol'nye zapolnyali pri vklyuchenii v issledovanie i posle okonchaniya kursa terapii. Rezul'taty issledovaniya. Na fone 10-dnevnogo kursa lecheniya dostoverno uluchshilsya sredniy pokazatel' kachestva zhizni po «termometru» oprosnika EQ. Pri analize sostavlyayushchikh kachestva zhizni vyyavleno, chto dostovernogo uluchsheniya pokazateley v kategoriyakh «peredvizhenie», «samoobsluzhivanie» i «povsednevnaya aktivnost'» ne dostignuto. Statisticheski dostovernaya polozhitel'naya dinamika poluchena v kategoriyakh «bol'/diskomfort», «trevoga/depressiya» i v otsenke obshchego sostoyaniya zdorov'ya po sravneniyu s takovym god nazad (tak nazyvaemaya perekhodnaya tochka zdorov'ya). Zaklyuchenie. Dazhe korotkiy kurs terapii movalisom statisticheski dostoverno uluchshaet kachestvo zhizni patsientov s osteoartrozom.Цель исследования. Оценивали влияние короткого курса терапии мовалисом на качество жизни пациентов с остеоартрозом. Материалы и методы. Для определения качества жизни больных использовался общий опросник EQ-5D. В течение 10 дней пациенты получали нестероидный противовоспалительный препарат мовалис, проводилась также терапия сопутствующих заболеваний. Анкету качества жизни EQ-5D больные заполняли при включении в исследование и после окончания курса терапии. Результаты исследования. На фоне 10-дневного курса лечения достоверно улучшился средний показатель качества жизни по «термометру» опросника EQ. При анализе составляющих качества жизни выявлено, что достоверного улучшения показателей в категориях «передвижение», «самообслуживание» и «повседневная активность» не достигнуто. Статистически достоверная положительная динамика получена в категориях «боль/дискомфорт», «тревога/депрессия» и в оценке общего состояния здоровья по сравнению с таковым год назад (так называемая переходная точка здоровья). Заключение. Даже короткий курс терапии мовалисом статистически достоверно улучшает качество жизни пациентов с остеоартрозом