the mechanism by which bi-and trivalent cations affect human liver phosphatidatephosphohydrolase (pap) activity was investigated. bivalent cations up to 1 mm increased pap activity whereas at higher concentrations the activity of the enzyme decreased. the stimulatory concentration for trivalent cations such as al3+ and cr3+, however, was much lower being 2 m m and 1 m m, respectively. all catio...

in concentration of hydrogen peroxide, first, the solution should be quite pure, and then, it concentrate with methods such as vacuum distillation and cooling crystallization, because impurities in the hydrogen peroxide solution in high concentrations are causing decomposition of this substance; that is very dangerous. the purpose of this article is separation of chromium and magnesium cations ...

in this study, a multi-objective genetic algorithm (moga) is utilized to extract interpretable and compact fuzzy rule bases for modeling nonlinear multi-input multi-output (mimo) systems. in the process of non- linear system identi cation, structure selection, parameter estimation, model performance and model validation are important objectives. furthermore, se- curing low-level and high-level ...

The present paper studies a particular collection of classi cation problems, i.e., the classi cation of recursive predicates and languages, for arriving at a deeper understanding of what classi cation really is. In particular, the classi cation of predicates and languages is compared with the classi cation of arbitrary recursive functions and with their learnability. The investigation undertake...

In this paper, we propose a solution to McCarthy’s qualification problem [lo] based on the notion of possible worlds [3, 61. We begin by noting that existing formal solutions to qualification seem to us to suffer from serious epistemological and computational difficulties. We present a formalization of action based on the notion of possible worlds, and show that our solution to the qualificatio...

This paper provides a general treatment of privacy ampliication by public discussion , a concept introduced by Bennett, Brassard and Robert for a special scenario. Privacy ampliication is a protocol that allows two parties to distill a secret key from a common random variable that is only partially secret, i.e. about which an eavesdropper has some partial information , where the two parties gen...

The control of the cation composition formamidinium (FA), methylammonium (MA), and cesium (Cs) has been used to engineer significant improvements in organic–inorganic perovskite solar cells. However, thermal stability mixed-cation cells is not fully understood. In this work, we present results an experimental study double-cation perovskites [(FAPbI 3 ) 0.97 (MAPbBr 0.03 ] [(FAMA)-perovskite (PS...