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11.
Tj. Hollander P.L. Lijnse B.J. Jansen L.P.L. Franken 《Journal of Quantitative Spectroscopy & Radiative Transfer》1973,13(7):669-671
The efficiency of resonance fluorescence, Y, of the strontium resonance line (1P1→1S0 transition) at 4607.33 Å was measured in CO/N2O, CO/O2/Ar, and H2/O2/CO2/N2 flames at atmospheric pressure. From these data, the specific quenching cross sections, σqu, for CO2 and CO were found to be (60 ± 10) Å2 and (300 ± 60) Å2, respectively. The experimental cross sections were confronted with the intermediate ionic-state curve-crossing model and chemical quenching model, respectively. 相似文献
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Uwe Franken 《Results in Mathematics》2001,39(1-2):28-57
For a weight function ω let ${\cal D}^{\prime}_{(\omega)}({\rm R}^{n})$ denote the space of ultradistibutions of Beurling type on ?n in the sense of Braun, Meise and Taylor [3]. In the present note the existence of certain (local) fundamental solutions $E\in{\cal D}^{\prime}_{(\omega)}({\rm R}^{n})$ for a partial differential operator P(D) with constant coefficients is characterized by an algebraic condition for the zeros of P and the weight function ω. 相似文献
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Priscila Franken Dick Felipe Lange CoelhoFabiano Severo Rodembusch Leandra Franciscato Campo 《Tetrahedron letters》2014
Fluorescent amphiphilic benzoxazole derivatives were synthesized and used to produce photoactive phosphatidylcholine (PC) liposomes by reserve-phase evaporation. The dyes absorbed in the UV region and were fluorescent in the blue-green region (determined by solvent polarity). The alkyl chain length seemed to play a fundamental role in the photophysics of the benzoxazole fluorophore in reverse liposomes, and despite the same ESIPT core and phospholipid building block, each amphiphilic dye had a particular emission profile related to the dye location in the liposome. The fluorescence emission spectra from dye 5 showed that its fluorophore experienced a polar environment, due to the single normal emission, while dyes 6–7 had (in part) a normal emission, and the main fluorescent band ascribed to the ESIPT emission indicated a more hydrophobic environment. Despite the complex fluorescent profiles, the benzoxazole derivatives could be successfully introduced into the reverse liposome structure due to the interaction between the alkyl chain and PC bilayer. 相似文献
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Norbert Franken 《Annali di Matematica Pura ed Applicata》2014,193(4):975-997
The present article deals with a variational formulation of a floating body in a perfect fluid. Since the considered energy functional depends on both stream function and floating body, these two minimizations are realized in two separated steps. By the use of free boundary methods, existence and Lipschitz continuity of the minimizing stream function are proved. In addition, it is shown that the corresponding free surface has Hölder boundary. The dependence on the floating body leads to an optimal shape problem which is treated by the use of Hausdorff convergence. Under the postulate of a bounded density parameter of the domain, the existence of an optimal floating body is shown. 相似文献
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Addition of PPh 2Cl and Tl[PF 6] to CH 2Cl 2 solutions of [N(PPh 3) 2][6,6,6-(CO) 3- closo-6,1-FeCB 8H 9] ( 1) affords the isomeric B-substituted species [6,6,6-(CO) 3- n-(PHPh 2)- closo-6,1-FeCB 8H 8] [ n = 7 ( 2a) or 10 ( 2b)]. Deprotonation (NaH) of the phosphine ligand in 2a, with subsequent addition of [IrCl(CO)(PPh 3) 2] and Tl[PF 6], yields the neutral, zwitterionic complex [6,6,6-(CO) 3-4,7-mu-{Ir(H)(CO)(PPh 3) 2PPh 2}- closo-6,1-FeCB 8H 7] ( 3), which contains a B-P-Ir- B ring. Alternatively, deprotonation using NEt 3, followed by addition of HC[triple bond]CCH 2Br, affords [6,6,6-(CO) 3-7-(PPh 2CCMe)- closo-6,1-FeCB 8H 8] ( 4). Addition of [Co 2(CO) 8] to CH 2Cl 2 solutions of the latter gives [6,6,6-(CO) 3-7-(PPh 2-{(mu-eta (2):eta (2)-CCMe)Co 2(CO) 6})- closo-6,1-FeCB 8H 8] ( 5), which contains a {C 2Co 2} tetrahedron. In the absence of added substrates, deprotonation of the PHPh 2 group in compounds 2, followed by reaction of the resulting anions with CH 2Cl 2 solvent, affords [6,6,6-(CO) 3- n-(PPh 2CH 2Cl)- closo-6,1-FeCB 8H 8] [ n = 7 ( 6a) or 10 ( 6b)] plus [6,6-(CO) 2-6,7-mu-{PPh 2CH 2PPh 2}- closo-6,1-FeCB 8H 8] ( 7, formed from 2a), of which the latter species possesses an intramolecular B-P-C-P- Fe ring. Addition of Me 3NO to CH 2Cl 2 solutions of 2a causes loss of an Fe-bound CO ligand and formation of [6,6-(CO) 2-6,7-mu-{NMe 2CH 2PPh 2}- closo-6,1-FeCB 8H 8] ( 8), which incorporates a B-P-C-N- Fe ring. A similar reaction in the presence of ligands L yields [6,6-(CO) 2-6-L-7-(PPh 2CH 2Cl)- closo-6,1-FeCB 8H 8] [L = PEt 3 ( 9) or CNBu (t) ( 10)], in addition to 8. 相似文献