Relatively pseudocomplemented Hilbert algebras

We characterise those Hilbert algebras that are relatively pseudocomplemented posets.      

Quasi-orthomodular Posets and Weak BCK-algebras

A quasi-orthomodular poset is defined to be a poset with 0 equipped with an orthogonality relation satisfying certain axioms. The goal of the paper is to compare such posets (also semilattices, nearlattices and lattices) with several other kinds of posets having an appropriate structure and already known in the literature: generalized orthomodular posets and lattices, generalized orthoalgebras, sectionally orthocomplemented, sectionally orthomodular and relatively orthocomplemented posets and meet semilattices, semi-orthomodular lattices, weak BCK-algebras.     

Freeoids: a semi-abstract view on endomorphism monoids of relatively free algebras

A freeoid over a (normally, infinite) set of variables X is defined to be a pair (W, E), where W is a superset of X, and E is a submonoid of W ^W containing just one extension of every mapping X → W. For instance, if W is a relatively free algebra over a set of free generators X, then the pair F(W) := (W, End(W)) is a freeoid. In the paper, the kernel equivalence and the range of the transformation F are characterized. Freeoids form a category; it is shown that the transformation F gives rise to a functor from the category of relatively free algebras to the category of freeoids which yields a concrete equivalence of the first category to a full subcategory of the second one. Also, the concept of a model of a freeoid is introduced; the variety generated by a free algebra W is shown to be concretely equivalent to the category of models of F(W). The sets X, W, and the algebras W may generally be many-sorted.     

SODIUM MONO-OCTYLPHDSPHINATES,SYNTHESIS, PURIFICATION AND SURFACTANT PROPERTIES

Sodium hypophosphite can be added to terminal hydrocarbon double bonds under specific conditions, according to a Free radical mechanism. The direct reaction using sodium hypophosphite produces sodium monaoctylphosphinate as the main reaction product, and the amount of dimer compound obtained is almost unsignificant. The reaction has been applied using 1-octene and, after purification of the monomer and dimer as acid compounds, the reaction yields have been determined. Surfactant properties, such as surface tension, wetting power and foaming power of the pure sodium monocctylphosphinate have bean measured.     

From electrochromic phenomena to energy harvesting and storage—an overview of solid state ionics research at the Institute of Solid State Physics,University of Latvia

Journal of Solid State Electrochemistry - Solid state ionics is one of the key research topics of the Institute of Solid State Physics, University of Latvia since its establishment. The research...