Dyspnoea improves following composite repair of giant paraoesophageal hernia.

Introduction: Paraoesophageal hernias (PEH) are often symptomatic and can lead to life-threatening complications such as volvulus and ischaemia. Dyspnoea is one of the most prevalent symptoms of giant hiatus herniae. The primary outcome of this study is resolution of dyspnoea following composite repair of giant paraoesophageal hernia.

The kinetic energy operator for distance-dependent effective nuclear masses: Derivation for a triatomic molecule.

The kinetic energy operator for triatomic molecules with coordinate or distance-dependent nuclear masses has been derived. By combination of the chain rule method and the analysis of infinitesimal variations of molecular coordinates, a simple and general technique for the construction of the kinetic energy operator has been proposed. The asymptotic properties of the Hamiltonian have been investigated with respect to the ratio of the electron and proton mass.

Investigation of Nonadiabatic Effects for the Vibrational Spectrum of a Triatomic Molecule: The Use of a Single Potential Energy Surface with Distance-Dependent Masses for H.

On the basis of first-principles, the influence of nonadiabatic effects on the vibrational bound states of H has been investigated using distance-dependent reduced masses and only one single potential energy surface. For these new vibrational calculations, potentials based on explicitly correlated wave functions are used where, in addition, adiabatic corrections and relativistic contributions are taken into account. For the first time, several different fully distance-dependent reduced mass surfaces in three dimensions have been incorporated in the vibrational calculations.

A systematic investigation of the ground state potential energy surface of H3+.

Based on different ab initio electronic structure calculations (CI-R12 and Gaussian Geminals) of the Born-Oppenheimer electronic energy E(BO) of H(3)(+) from high to highest quality, we build up a potential energy surface which represents a highly reliable form of the topology of the whole potential region, locally and globally. We use the CI-R12 method in order to get within reasonable CPU-time a relatively dense grid of energy points. We demonstrate that CI-R12 is good enough to give an accurate surface, i.

Lattice instability at phase transitions near the Lifshitz point in proper monoclinic ferroelectrics.

The temperature dependence of acoustic properties of the Sn(2)P(2)(Se(x)S(1-x))(6) uniaxial ferroelectric in the vicinity of the Lifshitz point (LP) was investigated by Brillouin spectroscopy and analysed in the Landau-Khalatnikov approximation. An anomalous decrease of the longitudinal hypersound velocity in the paraelectric phase caused by fluctuation effects and crystal structure defects has been found near the LP. Besides this, a small softening of the transverse acoustic phonons is observed, which is due to their linear interaction with the soft optic mode found for incommensurate phase transitions in proper ferroelectrics.