Abstract Four digestion procedures for microwave dissolution of soils and sediments are investigated. Accurate results (accuracy better than 10%) for lanthanides, Be, Bi, Te, Th, U and Y are obtained only after an overnight stay with a mixture of 2 ml 48% HF and 2 ml 65...

The first paper in which the notion of polynomial identity appears that I know of is a 1922 article of M. Dehn [D], where his goal was to generalize Pappus’ Theorem from projective geometry. (His program was carried out by S.A. Amitsur in 1966 [A4] using rational identi...

UDC 512.5 We determine the relative rank of the semigroup ${\scr T }(X,Y)$ of all transformations on a finite chain $X$ with restricted range $Y\subseteq X$ modulo the set ${\scr OP }(X,Y)$ of all orientation-preserving transformations in ${\scr T }(X,Y).$ Moreover, we ...

Introduction. Invasive apocrine carcinoma of the breast is a rare special subtype of mammary carcinoma and accounts for 0.3-1% of all breast malignancies. It has specific histological, immunohistochemical, and molecular genetic characteristics. The tumour cells have a u...

The Earth’s surface is a rigid lower boundary of the atmosphere. Due to this, a boundary layer exists in the wind velocity field or in other meteorological elements. Because the air flow is generally turbulent, this is a turbulent boundary layer rather than molecular. N...

Abstract The proton spin lattice relaxation time Tt has been measured for several samples of the binary system Triton X 114-water in the concentration range 20-90 per cent by weight. The correlation time, the activation energy and the constant of the dipole-dipole inter...

The field-effect transistor is used for a linear control of the acoustic radiation of single-electrode section of the surface-wave transducer. The electrically controlled surface-wave filters and delay lines, the characteristics of which may be specified by a set of con...

Abstract The concept of application of crumbled carbon foam obtained from polymer precursor as a filler in polymer/carbon composite was described. The carbon foam used as powdered reinforcement of composites was prepared from epoxy resin cross-linked with phenol–formald...