Experimental Study of the Productive Bed Filtration Mode Changed by an Unsteady Action on the Host Rock Blocks

A laboratory study including physical modeling of filtration processes in porous beds with similarity criteria satisfied is performed. It is demonstrated that weak dynamic actions on stressed host rock blocks can initiate repacking of the system of blocks, leading to an increase in pressure in the productive bed and in oil recovery. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 47, No. 1, pp. 131–138, January–February, 2006.     

Representations of bipartite completed posets

Авторы выражают глубокую благодарность ПГавиелю, предложившему много существенных улучшений статьи, и Б.Келлеру за английский перевод и внимательное чтение русского варианта.     

Cation selectivity of liquid-membrane electrodes based on macrocyclic lactones and lactonelactams

Selectivity coefficients are reported for liquid membranes containing 27 macrocyclic lactones and lactonelactams with respect to alkali and alkaline-earth metal ions. It is shown that introduction of amide and ester groups into cyclic polyethers can modify the cation selectivity over a wide range. The results indicate the possibility of obtaining various highly selective membrane electrodes based on these neutral macroheterocyclic compounds.