Showing papers by "Romanian Academy published in 1970"
01 Aug 1970
TL;DR: In this paper, the surface velocity field induced by the Marangoni effect is obtained experimentally for the steady dissolving of a low surface tension liquid at the free surface of a higher surface tension one.
Abstract: The surface velocity field induced by the Marangoni effect is obtained experimentally for the steady dissolving of a low surface tension liquid at the free surface of a higher surface tension one. Aliphatic alcohols C2C4 were used as the dissolving liquids, and water or aqueous solutions as the supporting liquids. The effects of surface tension and concentration differences as well as that of viscosity are examined. The experimental velocities are correlated as a function of the product Δ c( ∂ γ ∂c ) . Some qualitative explanations of the mechanism of the dissolving process under the action of surface forces are given.
57 citations
TL;DR: In this paper, a small drop of a soluble or partially soluble liquid having a smaller surface tension than water is put on a free air-water interface and the drop is fed continuously, it acquires the form of an extended lens outside of which a steady velocity field develops due to the Marangoni effect.
34 citations
TL;DR: In this paper, the hyperstability of a class of linear time-varying discrete systems is studied and sufficient conditions for hyper-stability and for stability in the sense of Lyapunov are obtained.
Abstract: The hyperstability of a class of linear time-varying discrete systems is studied. Sufficient conditions for hyperstability and for stability in the sense of Lyapunov are obtained.
5 citations
01 Jul 1970
TL;DR: In this paper, a comparison is made between recent conclusions concerning the effect of phase mismatch on the gain of traveling-wave parametric amplifiers and those of a previously published theory on the same subject.
Abstract: A comparison is made between recent conclusions concerning the effect of phase mismatch on the gain of traveling-wave parametric amplifiers and those of a previously published theory on the same subject, applicable for discrete traveling-wave parametric amplification.
1 citations
TL;DR: In this article, the hyperstability of linear time-varying discrete blocks is studied, and sufficient conditions for hyper-stability are obtained for special classes of multiple and simple blocks.
Abstract: The hyperstability of linear time-varying discrete blocks is studied Sufficient conditions for hyperstability are obtained for special classes of multiple and simple blocks
1 citations