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21.
Gehring and Pommerenke have shown that if the Schwarzian derivativeSf of an analytic functionf in the unit diskD satisfies |Sf(z)|≤, 2(1 - |z|2)–2 thenf(D) is a Jordan domain except whenf(D) is the image under a Möbius transformation of an infinite parallel strip. The condition |Sf(z)|≤ 2(1 - |z|2)–2 is the classical sufficient condition for univalence of Nehari. In this paper we show that the same type of phenomenon established by Gehring and Pommerenke holds for a wider class of univalence criteria of the form|Sf(z)|≤p(|z|) also introduced by Nehari. These include|Sf((z)|≤π 2/2 and|Sf((z)|≤4(1-|z| 2)–1. We also obtain results on Hölder continuity and quasiconformal extensions. 相似文献
22.
W. F. Osgood 《Mathematische Annalen》1900,53(3):461-464
Ohne Zusammenfassung 相似文献
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F. H. Vupré P. V. Vupré A. Gerasimow R. Bahr Fr. Grützmacher J. H. Walton R. C. Judd A. Stock K. Friederici W. Schuen M. Plüss Th. Paul Poda Jan von Zawidzki M. H. Palo Th. W. Richards G. D. Osgood R. Fänder J. G. Royd H. M. Atkinson W. R. Bousfield A. Whitaker S. H. Collins A. Slator J. Livingston R. Morgan Edy Björnsson Stéphan Jahn Ernest Esclangon P. B. Davis F. W. J. Boekhout H. Albrecht Alex L. Feild H. H. Bunzel H. Hasselbring Christ. gob & Co. 《Analytical and bioanalytical chemistry》1917,56(10-11):511-521
26.
Yizhou Le George G. Totir George W. Flynn Richard M. Osgood Jr. 《Surface science》2006,600(3):665-674
The surface chemistry of CBr2Cl2 on the Fe3O4(1 1 1)-(2 × 2) selvedge of single-crystal α-Fe2O3(0 0 0 1) has been investigated using temperature programmed reaction and desorption (TPR/D) measurements. The spectra obtained in this case show that strong chemisorption occurs and that a series of adsorbed halogenated reaction products are present. By comparison, studies of the adsorbed phase of CH2Cl2 show that only physisorption occurs. The TPR/D spectra of CBr2Cl2 show that dissociative formation of CCl2 followed by its reaction with lattice oxygen is central to the monolayer reaction chemistry in this chloromethane. The branching ratios of the various desorbed products are compared with those obtained from CCl4 adsorbed on the same (2 × 2) surface. 相似文献
27.
Clinton A. Krueger Christopher K. Hilton Mark Osgood Jianglin Wu Ching Wu 《International Journal for Ion Mobility Spectrometry》2009,12(1):33-37
Current commercially available ion mobility spectrometers are intended for the analysis of chemicals in the gas phase. Sample
introduction methods, such as direct air sampling, a GC injector or a thermal desorber, are commonly an integral part of these
instruments. This paper describes an electrospray ionization ion mobility spectrometer system that allows direct introduction
samples in solution phase. This allows direct analysis of non-volatile organic and biological samples, and avoids decomposition
of thermally liable samples, providing reliable chemical identification. In addition, the new ion mobility spectrometer allows
mobility analysis with high resolving power. Commonly used commercial IMS systems provide resolving powers between 10 and
30; this new ion mobility spectrometer has resolving power greater than 60 for routine analysis. A high resolution instrument
is necessary for many applications where a complex mixture needs to be separated and quantified. This paper demonstrates the
advantages of using a high resolution ion mobility spectrometer and an electrospray ionization source for the analysis of
non-volatile pharmaceuticals as well as dissolved explosive in solution phase. 相似文献
28.
Measurements of the thermal desorption of methyl bromide (MeBr) from bare and RS-functionalized GaAs(110), where R = CH3 and CH3CH2, reveal marked systematic changes in molecule-surface interactions. As the thickness of the organic spacer layer is increased, the electrostatic MeBr-GaAs(110) interaction decreases, lowering the activation energy for desorption, Ed, as well as decreasing the critical coverage required for nucleation of bulklike MeBr. On the CH3CH2S-functionalized surface, Ed is lowered to a value roughly equal to that for desorption from three-dimensional (3-D) clusters; because the kinetics of desorption of isolated molecules differs from that for desorption from clusters, desorption of isolated molecules from the organic surface occurs at a lower temperature than desorption from the clusters. Thus, the "monolayer" desorption wave occurs at a lower temperature than the "multilayer" desorption wave. These results illustrate the role that organic chain length in nanometer-scale thin films can play in alteration of the delicate balance of interfacial interactions. 相似文献
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