Results 281 to 290 of about 321,734 (315)
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Journal of Modern Optics, 1991
This paper is the fourth, and last, in the series on active optics as realized in the ESO New Technology Telescope (NTT). It gives a detailed description of the set-up and optimization of the optical system, based on the three levels (i.e. time frequencies) of active correction. The first results in direct imagery with the telescope optimized only near
R.N. Wilson +3 more
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This paper is the fourth, and last, in the series on active optics as realized in the ESO New Technology Telescope (NTT). It gives a detailed description of the set-up and optimization of the optical system, based on the three levels (i.e. time frequencies) of active correction. The first results in direct imagery with the telescope optimized only near
R.N. Wilson +3 more
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Coupled Ferroelectricity and Optical Activity in Optically Active Ferroelectrics
The Journal of Physical Chemistry LettersFerroelectricity was initially discovered in 1921 in Rochelle salt (potassium sodium tartrate tetrahydrate), a chiral compound containing a chiral unit. However, the inherent relationship between coupled ferroelectricity and optical activity in chiral ferroelectrics derived from achiral units, as well as in polar ferroelectrics, remains insufficiently ...
Xiang-Bin Han, Wen Zhang
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Journal of Modern Optics, 1987
A system of ‘active optics’ control for the optical imagery of astronomical telescopes has been under development in the European Southern Observatory for about ten years. Its first application will be in the 3·5 m New Technology Telescope (NTT) scheduled for operation in 1988.
R.N. Wilson, F. Franza, L. Noethe
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A system of ‘active optics’ control for the optical imagery of astronomical telescopes has been under development in the European Southern Observatory for about ten years. Its first application will be in the 3·5 m New Technology Telescope (NTT) scheduled for operation in 1988.
R.N. Wilson, F. Franza, L. Noethe
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Applied Optics, 2014
In this work, we propose an active optical zoom system. The zoom module of the system is formed by a liquid lens and a spatial light modulator (SLM). By controlling the focal lengths of the liquid lens and the encoded digital lens on the SLM panel, we can change the magnification of an image without mechanical moving parts and keep the output plane ...
Di, Wang +4 more
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In this work, we propose an active optical zoom system. The zoom module of the system is formed by a liquid lens and a spatial light modulator (SLM). By controlling the focal lengths of the liquid lens and the encoded digital lens on the SLM panel, we can change the magnification of an image without mechanical moving parts and keep the output plane ...
Di, Wang +4 more
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Optical Activity of Biopolymers
Nature, 1969Theoretical and experimental advances have led to a reassessment of the interpretation of optical rotatory dispersion and circular dichroism of nucleic acids, proteins and related compounds. The present state of the field is reviewed in this article.
W B, Gratzer, D A, Cowburn
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Optically active metal nanoparticles
Chemical Society Reviews, 2009Optical activity and its relation with chiral metal nanoparticles are revised in this tutorial review. The experimental evidence as well as the different mechanisms to explain the optical activity of ligand-protected nanoparticles are described, emphasizing the aspects that provide insights into this novel phenomenon at the nanoscale.
Cecilia, Noguez, Ignacio L, Garzón
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Aromaticity and Optical Activity
Journal of the American Chemical Society, 2015The relationship between aromaticity and optical activity is investigated in comparisons of heterocycles with 4n + 2 and 4n π-electrons, in cyclic ketones with and without aromatic resonance structure representations, in tautomers and pericyclic reaction partners in which only one compound of each pair is aromatic, and in partially hydrogenated cyclo ...
Veronica L, Murphy +2 more
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Journal of Agricultural and Food Chemistry, 1999
The accepted derivation of lignins from non(enzymatically)-controlled radical coupling reactions has been recently challenged, and it is relevant to ascertain unequivocally whether lignins are or are not (as normally assumed) optically active. Two approaches were used. First, DFRC (derivatization followed by reductive cleavage) dimers derived from beta-
J, Ralph +4 more
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The accepted derivation of lignins from non(enzymatically)-controlled radical coupling reactions has been recently challenged, and it is relevant to ascertain unequivocally whether lignins are or are not (as normally assumed) optically active. Two approaches were used. First, DFRC (derivatization followed by reductive cleavage) dimers derived from beta-
J, Ralph +4 more
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Optical activity and evolution
Journal of Theoretical Biology, 1980It is noted that the chemical reactions occurring in rarefied cosmic clouds (molecular concentration less than or approximately to 10(2) cm-3) differ from similar laboratory reactions by the much greater effect on the outcome of external force fields.
G P, Gladyshev, M M, Khasanov
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Optically Active Organic Microrings
Nano Letters, 2003Udgivelsesdato ...
Balzer, F. +4 more
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