Electro-elastic interactions and second order anisotropic constitutive equations

Piezoelectricity is usually expressed as an interaction between mechanical and electrical variables. The physics involved is hence governed by a coupling between Maxwell's equations of electromagnetism and the equations of elasticity. Such a coupling takes us through the piezoelectric constitutive relations. In this work, the second order anisotropic constitutive equations are treated, and in particular, the number of independent material constants is computed for all the 32 crystallographic classes.Paper presented, in reduced version, at the 12th Italian National Congress of Theoretical and Applied Mechanics (AIMETA '95), October 1995, Naples, Italy.     

Synthesis of cationic allyl complexes from trinuclear carbonyl clusters of iron,ruthenium and osmium

Thermal and photochemical reactions of trinuclear carbonyls of Fe, Ru, Os with allyl alcohol in acidic meclium as well as their reactions with (CH₃)₃NO · 2H₂O with subsequent protonation have been studied. Cationic mononuclear allyltetra-carbonyl complexes of Fe, Ru, Os and a cationic Os cluster with π-allyl ligand, have been obtained.     

Reaction of σ-(2-acylvinyl)dicarbonyl-π-cyclopentadienylirons with certain nucleophilic reagents

Conclusions The reactions of the compounds RCOCH=CHFe(CO)₂C₅H₅ with nucleophilic reagents go analogously to the corresponding reactions of-substituted vinyl ketones.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 360–362, February, 1969.     

Complexes of 3,6-diarylpyridazines with iron carbonyls

Conclusions The reaction of Fe₂(CO)₉ with 3,6-diarylpyridazines leads to complexes of the type: ligand·Fe₂(CO)₆, in which one CO group can be easily replaced by the Ph₃P molecule.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1574–1576, July, 1971.     

Transition to Chaos in the Floating Half Zone Convection

The transition process from steady convection to chaos is experimentally studied in thermocapillary convections of floating half zone. The onset of temperature oscillations in the liquid bridge of floating half zone and further transitions of the temporal convective behaviour are detected by measuring the temperature in the liquid bridge. The fast Fourier transform reveals the frequency and amplitude characteristics of the flow transition. The experimental results indicate the existence of a sequence of period-doubling bifurcations that culminate in chaos. The measured Feigenbaum numbers are δ2 =4.69 and δ4 = 4.6, which are comparable with the theoretical asymptotic value δ=4.669.