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Microwave-enhanced exciton delocalisation in low-dimensional CdTe/CdMnTe and CdMnTe/CdMgTe quantum well structures

100%

Godlewski M. , Ivanov V. Y. , Khachapuridze A.

tom Vol. 48, No. 4

346-354

In this work we descrjbe new application of the technique of optically detected cyclotron resonance (ODCR) to the studies of localisation processes in quantum well structures of CdTe/CdMnTe and CdMnTe/CdMgrre. Interaction between rnicrowave-eated free carriers, at cyclotron. resonance conditions, and either site- or impurity-localised excitons results in modificatjon of photoluminescence from the sample. In consequence, cyclotron resonance of free carriers can be detected optically. We show here that the tech-nique of ODCR allows us to monitor processes of carrier/exciton localisation and also to evaluate their influence on radiative recombination processes in quantum well structures. We conclude that localisation effects are crucial to explain operation of CdTe/CdMnTe and CdMnTe/CdMgTe structures as light modulators.

Określenie właściwości smarnych oleju napędowego z hydrokrakingu w funkcji zawartości estrów CHO

63%

Kajdas C. , Korycki J. , Frydrych J.

tom nr 2

219-227

W pracy przedstawiono wybrane wyniki badań właściwości smarnych dodatków estrowych CHO (węgiel, wodór i tlen) w oleju napędowym z hydrokrakingu o zawartości siarki poniżej 5 ppm.

The paper presents findings concerning lubricity proprieties of four CHO (carbon, hydrogen and oxygen) ester additives: cholesteryl acetate, methyl butyrate, methyl decanoate and cholesteryl palmitate, added to a hydrocracked diesel fuel base oil (LON) - containing less than 5 ppm sulphur - in the concentration range from 100 to 10000 ppm. One proposed a new mechanism of the ester hydrolysis and the formation of the film which is the result of the action of excited states produced during the friction process. The friction process releases the free energy to structures and molecules of the core, the surface layer, Langmuir - Blodget layer and the lubricant, and in the form of chemical energy at fragmentation of the additive molecules, and additionally also by generating electrons plus quanta of the energy such as : photons, phonons, excitons, solitons etc. [L. 2]. The formation of anion-radicals and tribochemical processes stimulated are processes releasing of the energy, small particles and fragments of molecules.