Abstract We present a practical analysis of the fermion sign problem in fermionic path integral Monte Carlo (PIMC) simulations grand-canonical ensemble (GCE). As representative model system, we consider electrons 2D harmonic trap. find that GCE is even more severe than canonical at same conditions, which, general, makes latter preferred option. Despite these difficulties, show PIMC are still fe...

The transformation of the RGB colour space to a hue, saturation and brightness colour space is essentially a conversion from a rectangular coordinate system to a cylindrical coordinate system. Nevertheless, a bewildering array of such conversions exist. We show that one of the main reasons for this is the dependence of the saturation values on the choice of the brightness function, and suggest ...

We extended the analysis of the thermal conductivity measurements of helium confined in cylindrical channels of glass capillary arrays to the case of rectangular channels. Measurements were made on plates with channels of 1x10 micro-m cross section, and simultaneously on bulk helium. To our great surprise the results show that the finite-size scaling-function for this geometry does not differ m...

This paper presents a three dimensional application of direct Boundary-Element Method (BEM) for computing interaction of sinusoidal waves with a large submerged open bottom structure near the floor with finite depth. The wave diffraction problem is formulated within the framework of linearized potential theory and solved numerically with direct BEM. A computer program based on BEM is developed ...

The vacuum expectation values of the field squared and the energy-momentum tensor are investigated for a scalar field with Dirichlet boundary conditions and for the electromagnetic field inside a wedge with a coaxial cylindrical boundary. In the case of the electromagnetic field perfectly conducting boundary conditions are assumed on the bounding surfaces. By using the Abel-Plana-type formula f...