The B–H bond length of the borohydride anion (BH4?) in alkali metal borohydrides MBH4 with M = Na, K, Rb, Cs, and diluted different halide matrices, was investigated experimentally by infrared spectroscopy (FTIR) theoretically using first principles calculations. peak positions IR absorption spectra NaBH4 pressed at 754 MPa halides NaX KX X Cl, Br, I show significant variations indicating ion e...

Chechen, Ingush and Batsbi together form the Nakh subgroup of East Caucasian language family. Chechen Ingush, to a lesser degree Batsbi, underwent regressive vowel assimilation (umlaut). The sound laws that govern umlaut have already been established some degree. article focuses on two issues: rules for dialects are worked out in detail basis dialectal material provided by Imnajshvili 1977, dif...

(Nax□1 - x)5[MnO2]13 has been synthesized with x = 0.80 (4), corresponding to Na0.31[MnO2]. This well known material is usually cited as Na0.4[MnO2] and is believed to have a romanèchite-like framework. Here, its true structure is determined, ab initio, by single-crystal electron diffraction tomography (EDT) and refined both by EDT data applying dynamical scattering theory and by the Rietveld m...

Response surface methodology (RSM) relies on the design of experiments and empirical modelling techniques to find the optimum of a process when the underlying fundamental mechanism of the process is largely unknown. This paper proposes an iterative RSM framework, where Gaussian process (GP) regression models are applied for the approximation of the response surface. GP regression is flexible an...