Institution
Romanian Academy
Archive•Bucharest, Romania•
About: Romanian Academy is a archive organization based out in Bucharest, Romania. It is known for research contribution in the topics: Population & Nonlinear system. The organization has 3662 authors who have published 10491 publications receiving 146447 citations. The organization is also known as: Academia Română & Societatea Literară Română.
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01 Jan 1990TL;DR: This work has suggested that a quantum formalism can describe both unconscious mechanical brain processes connected with the complex patterns of neuronal activity as well as the conscious activity of the brain.
Abstract: Recent works [1], [2], [3], [4] have raised the possibility that a quantum formalism can describe both unconscious mechanical brain processes connected with the complex patterns of neuronal activity as well as the conscious activity of the brain A Hilbert structure has been assumed in order to describe an evolution equation like the Schroedinger equation
231 citations
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TL;DR: In this article, Popescu et al. presented new calculations of the attenuation of stellar light from spiral galaxies using geometries for stars and dust which can reproduce the entire spectral energy distribution from the ultraviolet (UV) to the Far-infrared (FIR)/submillimeter (submm) and can also account for the surface brightness distribution in both the optical/NIR (NIR) and FIR/submm).
Abstract: We present new calculations of the attenuation of stellar light from spiral galaxies using geometries for stars and dust which can reproduce the entire spectral energy distribution from the ultraviolet (UV) to the Far-infrared (FIR)/submillimeter (submm) and can also account for the surface brightness distribution in both the optical/Near-infrared (NIR) and FIR/submm. The calculations are based on the model of Popescu et al. (2000), which incorporates a dustless stellar bulge, a disk of old stars with associated diffuse dust, a thin disk of young stars with associated diffuse dust, and a clumpy dust component associated with star-forming regions in the thin disk. The attenuations, which incorporate the effects of multiple anisotropic scattering, are derived separately for each stellar component, and presented in the form of easily accessible polynomial fits as a function of inclination, for a grid in optical depth and wavelength. The wavelength range considered is between 912A and 2.2 μm, sampled such that attenuation can be conveniently calculated both for the standard optical bands and for the bands covered by GALEX. The attenuation characteristics of the individual stellar components show marked differences between each other. A general formula is given for the calculation of composite attenuation, valid for any combination of the bulge-to-disk ratio and amount of clumpiness. As an example, we show how the optical depth derived from the variation of attenuation with inclination depends on the bulge-to-disk ratio. Finally, a recipe is given for a self-consistent determination of the optical depth from the Hα/Hβ line ratio.
222 citations
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TL;DR: The interaction between bovine serum albumin (BSA) and several surfactants has been investigated by light scattering as discussed by the authors, showing that cooperative binding of DTAB occurs at higher surfactant concentrations than in comparative solutions of SDS and C12E8.
Abstract: The interaction between bovine serum albumin (BSA) and several surfactants has been investigated by light scattering. Anionic (sodium dodecyl sulfate, SDS), cationic (dodecyl trimethylammonium bromide, DTAB), and nonionic (polyoxyethylene 8 lauryl ether, C12E8) surfactants, all containing a C12 alkyl chain, were used to study the effect of different headgroups on the complex formation. The hydrodynamic radii of the complexes obtained by dynamic light scattering indicate that cooperative binding of DTAB occurs at higher surfactant concentrations than in comparative solutions of SDS and C12E8. The effect of chain length is shown for the cationic surfactants DTAB and cetyl trimethylammonium bromide (CTAB, C16 alkyl chain). The higher surface activity of CTAB results in complex formation at a lower surfactant concentration compared to DTAB. The hydrodynamic radii of the BSA−SDS and BSA−DTAB complexes at saturation were determined as ∼5.9 nm and ∼4.8 nm, respectively. The hydrodynamic radius of the reduced BSA...
220 citations
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TL;DR: In this paper, the qualitative analysis of solutions to nonlinear elliptic problems of the type { − div A (x, ∇ u ) = λ | u | q (x ) − 2 u in Ω u = 0 on ∂ Ω, where Ω is a bounded or an exterior domain of R N and q is a continuous positive function.
Abstract: In this survey paper, by using variational methods, we are concerned with the qualitative analysis of solutions to nonlinear elliptic problems of the type { − div A ( x , ∇ u ) = λ | u | q ( x ) − 2 u in Ω u = 0 on ∂ Ω , where Ω is a bounded or an exterior domain of R N and q is a continuous positive function. The results presented in this paper extend several contributions concerning the Lane–Emden equation and we focus on new phenomena which are due to the presence of variable exponents.
218 citations
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TL;DR: In this article, a concise overview is given on mononuclear and dinuclear, bidentate Schiff base ruthenium complexes with different additional ligands and their applications in various chemical transformations such as Kharasch addition, enol-ester synthesis, alkyne dimerization, olefin metathesis and atom transfer radical polymerization.
218 citations
Authors
Showing all 3740 results
Name | H-index | Papers | Citations |
---|---|---|---|
Cristina Popescu | 74 | 285 | 18434 |
Adrian Covic | 73 | 570 | 17379 |
Gheorghe Paun | 65 | 399 | 18513 |
Floriana Tuna | 60 | 271 | 11968 |
Arto Salomaa | 56 | 374 | 17706 |
Jan A. Bergstra | 55 | 616 | 13436 |
Alexandru T. Balaban | 53 | 605 | 14225 |
Cristian Sminchisescu | 53 | 173 | 12268 |
Maya Simionescu | 47 | 192 | 10608 |
Marius Andruh | 46 | 239 | 8431 |
Werner Scheid | 46 | 518 | 9186 |
Vicenţiu D. Rădulescu | 46 | 360 | 7771 |
Cornelia Vasile | 44 | 297 | 7108 |
Irinel Popescu | 44 | 401 | 8448 |
Mihail Barboiu | 44 | 239 | 5789 |