Method to evaluate the strength of interfaces in polymeric systems

It is shown that CT (compact tension) specimens known from fracture mechanics are adequate to study the strength of interfaces between polymers. The interface is coplanar with the initial notch. The capability of this method is demonstrated by quantifying: (a) the healing procedure of cracks in polystyrene; (b) by elaborating the influence of powders on the welding process in polystyrene; (c) by measuring the strength of interfaces between the different polymers SAN, PMMA, HIPS, PS, PC, and (d) by characterising the influence of a compatibilizer in the interface between PE and HIPS.     

First observation of yrast band in odd-odd162Lu

High spin states of the odd-odd¹⁶²Lu nucleus have been studied via¹⁴⁷Sm(¹⁹F,4nγ)¹⁶²Lu reaction at 95 MeV beam energy. Level scheme for yrast band based onπ[h_11/2 v[i_13/2] quasiparticle configuration was established up to I ^π = (23^?) for the first time. This band shows the signature inversion in energy before backbending generally appeared in this mass region. It is stressed that the signature splitting in¹⁶²Lu is larger than that in the¹⁶⁰Tm nucleus.     

Robinson-Trautman equations and Chandrasekhar's special perturbation of the Schwarzschild metric

A perturbation wave solution of the Robinson-Trautman equations is proved to be a perturbation of the Schwarzschild black hole which describes an outgoing axial gravitational wave and corresponds to a special case of Chandrasekhar's algebraically special perturbation of the Schwarzschild metric.     

Stability of control systems with a moving optimization interval for a class of nonlinear plants

We investigate the stability of the control system with a moving optimization interval for a nonlinear discrete dynamic plant with additive controls. Sufficient stability conditions are derived for a control system with an arbitrary finite lookahead interval.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 63, pp. 116–118, 1987.     

Single access hashing with overflow separators for dynamic files

The dynamic external hashing proposed in this paper allocates records according to the spiral storage technique. Separators derived from the signature technique are used for distinguishing primary from overflow records and for subdividing overflow chains into segments allocated into the primary file. Single access retrieval is obtained by means of a main memory index with an entry per bucket and containing separators and pointers. While this method uses a larger index than other recent proposals, it is much more convenient regarding load factor and insertion cost. Furthermore, file expansion is directed by various control parameters, thus allowing the user to choose the most suitable policy for his application.