119,731 research outputs found
Kinetic theory of dusty plasmas. IV. Distribution and fluctuations of dust charges
No full textThe recent results of the kinetic theory of dusty plasmas [V. N. Tsytovich and U. de Angelis, Phys. Plasmas 6, 1093 (1999)] are used to investigate the distribution and fluctuations of the dust charges in dusty plasmas. It is shown that the charge fluctuations induced by dust discreteness can be larger than the fluctuations due to electron and ion discreteness. A new Lorentz form for the regular part of the dust charge distribution is found. (C) 2002 American Institute of Physics
Low frequency responses, and wave dispersion in dusty plasmas
No full textThe self-consistent dusty-plasma response found in the kinetic theory [V. N. Tsytovich and U. de Angelis, Phys. Plasmas 6, 1093 (1999)] is generalized to include collisions of all species with neutrals, a situation often important in the experiments, and used to derive a new dispersion relation for low-frequency waves in dusty plasmas. An estimate of the differences with previous results is given for the particular case of dust-acoustic waves without the effects of collisions with neutrals: the present theory reproduces the result of Rao, Shukla, and Yu [Planet. Space Sci. 38, 543 (1990)] only for low dust density and small wavelengths, but strong deviations occur at larger wavelengths and dust densities
Design of Ru(II) sensitizers endowed by three anchoring units for adsorption mode and light harvesting optimization
No full textWe report the design, synthesis and computational investigation of a class of Ru(II)-dyes based on mixed bipyridine ligands for use in dye-sensitized solar cells. These dyes are designed to preserve the optimal anchoring mode of the prototypical N719 sensitizer by three carboxylic groups, yet allowing for tunable optimization of their electronic and optical properties by selective substitution at one of the 4-4′ positions of a single bipyridine ligand with π-excessive heteroaromatic groups. We used Density Functional Theory/Time Dependent Density Functional Theory calculations to analyze the electronic structure and optical properties of the dye and to investigate the dye adsorption mode on a TiO2 nanoparticle model. Our results show that we are effectively able to introduce three carboxylic anchoring units into the dye and achieve at the same time an enhanced dye light harvesting, demonstrating the design concept. As a drawback of this type of dyes, the synthesis leads to a mixture of dye isomers, which are rather tedious to separate
Come tradurre Milo De Angelis
No full textThe section presents the Chinese translation of four poems by Milo De Angelis, who is
among the best Italian contemporary poets. The poems are taken from the collection "Incontri e agguati" (Mondadori, 201 5). The texts are both in Italian and Chinese in parallel
text. Yang Lin, with the help of Geng Jiang (Chinese musician and poet), took care of the
translation.
The section opens with a note made by the translation group that analyses the processes
of the transposition of the dense poetic language of De Angelis into the Chinese language.
There follows an enlightening letter from Milo De Angelis to the translation group. The four
poems in Chinese and Italian complete the section
- …
