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Optimization procedure for pulse separation in cross-correlation PIV (1996)

Boillot, A. ; Prasad, A. K.

Springer

Experiments in fluids 21 (1996), S. 87-93

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ISSN: 1432-1114

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract In PIV, the optimal time separation (Δt) between successive laser pulses is influenced by a number of parameters. In the present paper, only two kinds of error affecting the choice of Δt are studied: (i) random error arising from noise during recording of the flow seeded with tracer particles and subsequent interrogation of the particle images, and (ii) acceleration error arising from approximation of the local Eulerian velocity based on small (but non-zero) particle displacements. These two kinds of error place conflicting requirements on Δt. A model to optimize Δt with respect to these errors is described, and the model is confirmed by the results of a Monte Carlo simulation. This model for optimal Δt is extended to various acceleration distributions. An estimate for the spatial resolution of the velocity field resulting from cross-correlation PIV is proposed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00193911

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First Evidence of a Photoinduced Spin Change in an FeIII Complex Using Visible Light at Room Temperature (1999)

Sour, Angélique ; Boillot, Marie-Laure ; Rivière, Eric ; [et al.]

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 2117-2119

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ISSN: 1434-1948

Keywords: Spin crossover ; Light-induced spin change ; cis-trans Isomerization ; Visible light irradiation ; Iron(III) ; Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: An iron(III) complex [Fe(salten)(Mepepy)]BPh4 containing only one photoisomerizable ligand (Mepepy) has been synthesized, it exhibits a thermally-induced spin crossover in the solid state and in solution {H2salten = 4-azaheptamethylene-1,7-bis(salicylideneiminate); Mepepy = 1-(pyridin-4-yl)-2-(N-methylpyrrol-2-yl)ethene}. The photoisomerizations of both the free and coordinated Mepepy ligand have been observed at room temperature with visible-light irradiation and monitored by UV/Vis and 1H NMR spectrometries. trans-to-cis isomerization of only one photosensitive ligand in the iron(III) complex is sufficient to detect a partial spin change of the iron(III) ion. This photoinduced spin change is seen for the first time from a high-spin state to a low-spin state.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

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