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41.
High-pressure phonon spectroscopy was performed on iron in the bcc and hcp phase up to 40 GPa using the nuclear inelastic scattering (NIS) of synchrotron radiation (SR). In hcp iron we observe differences in the density of phonon states for spectra measured with different orientations of the diamond anvil cell (DAC) with respect to the SR beam. These differences are attributed to a preferred orientation of the hexagonal c -axis along the load axis of the DAC. These texture effects are used, in conjunction with theoretical calculations, to extract density of phonon states as seen parallel and perpendicular to the c -axis of hcp iron. 相似文献
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In the present work a capillary electrophoretic method for the analysis of monosaccharides utilizing indirect UV-detection
has been developed. Different probes for indirect detection have been assessed using model carbohydrate samples. Background
electrolytes with or without addition of cetyltrimethylammonium bromide have also been evaluated regarding the separation
power. Furthermore, a curve-fitting algorithm has been introduced to increase the separation resolution. The optimized method
has been used for analysis of monosaccharides from an acidically hydrolyzed pulp sample. 相似文献
45.
A. Bruno M. Alfè A. Ciajolo C. de Lisio P. Minutolo 《Applied physics. B, Lasers and optics》2008,90(1):61-67
In this work we describe an application of the time-resolved fluorescence polarization anisotropy (TRFPA) technique to the
analysis of asphaltenes, complex mixtures of high-molecular weight compounds, typically present in petroleum oils. Our asphaltene
samples consist of nanometer-sized polydispersed particles, whose lighter fraction showed a relatively high fluorescence quantum
yield. Most of the fluorescence intensity observed from the complex sample originated from a well defined sample fraction
presenting a large fluorescence yield. Consequently, the TRFPA analysis only provided the average size of more fluorescing
particles, that, in our case, were the smaller ones. Larger and less fluorescing aggregates did not significantly contribute
to the TRFPA signal. Hence, to overcome intrinsic limitations of the TRFPA technique in characterizing multimodal samples,
we preliminarily fractionated our complex samples by means of size exclusion chromatography (SEC), thus obtaining nearly monomodal
fractions of the original samples. This procedure allowed to estimate also the size of less fluorescing and larger particles.
A comparison of particle size estimate by means of TRFPA and SEC methods was also used to acquire information about occurrence
of aggregation phenomena, and about the kind and strength of the chemical bonds linking chromophores to each other or to their
parent particle.
PACS 82.53.Uv; 82.80.Bg; 47.57.E- 相似文献
46.
G. Prange E. O. Whittier C. S. Trimble E. Pijanowski R. Lucentini Elsa Drago S. Bezzi S. Sacconi J. Großfeld B. W. Hammer C. R. Barnicoat M. Baumann A. Iwanowa A. Ljutenberg T. Dudkina H. Schmalfuß O. Benecke A. Koss Ciusa Waller H. Toms R. T. M. Haines J. C. Drummond N. Evers A. G. Jones W. Smith I. Tveraaen Alf Klem W. Leithe R. Strohecker A. F. H. Ward und G. D. France 《Fresenius' Journal of Analytical Chemistry》1937,108(7-8):292-304
Ohne Zusammenfassung 相似文献
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Alf B. Rustad 《Journal of Mathematical Analysis and Applications》2002,271(1):16-30
We introduce an image transformation as a generalization of measurable maps. Structure properties of the image transformation is given. Unique extension of image transformations from solid sets is proven. The multidimensional median and sample median are presented as image transformations, providing a construction suitable for probability theorists. 相似文献
49.
Carol Alf 《Journal of multivariate analysis》1975,5(3):322-329
In this paper, results of Lai, Heyde, and Rohatgi concerning the convergence rates for the laws of large numbers are extended for the case of independent random variables taking values in a separable Banach space. 相似文献
50.