Silicon-mediated Transformations of Functional Groups

Mechanically induced transformations in silicon

Mechanicky indukované premeny kremíka V práci sa študujú zmeny veľkosti častíc a štruktúry kremíka pri vibračnom a planetárnom mletí vo vzduchu a v kvapalinách rôznej permitivity (metanol, acetón a benzén). Kinetika redukcie veľkosti častíc a zmien štruktúry závisí od relatívneho zrýchlenia pohybu mlecích telies a od povahy mlecieho prostredia. Najefektívnejšie zjemnenie a ochrana povrchu prášk...

the effect of functional/notional approach on the proficiency level of efl learners and its evaluation through functional test

in fact, this study focused on the following questions: 1. is there any difference between the effect of functional/notional approach and the structural approaches to language teaching on the proficiency test of efl learners? 2. can a rather innovative language test referred to as "functional test" ge devised so so to measure the proficiency test of efl learners, and thus be as much reliable an...

Copper-mediated asymmetric transformations*

Copper-catalyzed reactions include the enantioselective conjugate addition and the SN2′ substitution. We describe the genesis of these reactions, the choice of the primary organometallic reagent, and our studies on finding new Michael acceptors and new ligands. We also report on the use of the zinc enolate generated upon conjugate addition. INTRODUCTION Organocopper chemistry has found widespre...

Thermally induced structural transformations on polymorphous silicon

Polymorphous Si is a nanostructured form of hydrogenated amorphous Si that contains a small fraction of Si nanocrystals or clusters. Its thermally induced transformations such as relaxation, dehydrogenation, and crystallization have been studied by calorimetry and evolved gas analysis as a complementary technique. The observed behavior has been compared to that of conventional hydrogenated amor...

On Certain Groups of Birational Contact Transformations*