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in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...
Many experiments have evidenced that electrical and chemical synapses -- hybrid coexist in most organisms brain structures. The role of synapse connection diversity neural activity generation has been investigated separately networks varying complexities. Nevertheless, theoretical understanding diverse dynamical states for self-organization robustness still not fully studied. Here, we present a...
abstract although music possesses some kind of power and using it has been welcome by many students in language classrooms, it seems that they take a non-serious image of the lesson while listening to songs and they may think that it is a matter of fun. the main objective of the present study was to investigate whether learning a foreign language through musical texts (songs) can have an impac...
The heart failure syndrome (HF) has diverse etiologies. In a 22-year study of predictors of HF in 126,235 persons, we attempted to identify etiologic factors independent of associated coronary heart disease (CAD) in 2594 persons hospitalized for the condition. For this purpose, subjects were stratified according to whether CAD was present. Of the subjects, 60% had evidence for CAD (CAD-HF). Bec...
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