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421.
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Rolf Berndt 《Mathematische Zeitschrift》1986,191(3):351-361
Ohne Zusammenfassung 相似文献
424.
H. W. Stuhlsatz und R. Berndt 《Fresenius' Journal of Analytical Chemistry》1986,324(3-4):257-258
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Summary By summation of ET-AAS signals resulting from repeated measurement runs, the power of detection can be increased in some cases to such degree that no chemical trace element separation and preconcentration need to be carried out. The accuracy of results obtained from signal summation was confirmed by two different independent methods (trace element separation and preconcentration methods). 相似文献
427.
H. Berndt und D. Sopczak 《Fresenius' Journal of Analytical Chemistry》1987,329(1):18-26
Summary The direct determination of trace elements in urines with ET-AA-spectrometry leads to numerous systematic errors. Part of these errors can be discovered by time-resolved signals and can thereby be avoided. Contrary to the assumption that optimal results can be obtained via the signal area, it is often the measurement of the signal height, which is to be given preference (better ratio of atomic absorption signal/background signal). Phosphate-containing matrix modifiers cause systematic interferences; their use should therefore be avoided. The determination of cobalt traces with the ET-AA-spectrometry and with D2-background correction will always yield wrong values, if samples contain at the same time phosphorous oxygen compounds as well as alkali compounds. Previous Co-determinations which were carried out with this method, should therefore be controlled in a number of biotic matrices. When Zeeman-correction is used, such errors will not occur. 相似文献
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A doubly temperature-sensitive core-shell microgel composed of two temperature-sensitive polymers with different lower critical solution temperatures (LCSTs) in the core and shell has been studied by small-angle neutron scattering (SANS). The application of a novel universal form factor model in the analysis of the SANS data reveals that the radial density profile at temperatures above the LCSTs of both polymers can be well described by a two-box profile with narrow interfaces. At temperatures between the LCSTs, the radial density profile reveals that the core in the core-shell microgel has larger dimensions than the naked core. Thus the swollen shell pulls the core apart. At temperatures below both LCSTs, however, the shell restricts the core swelling, and the core is found to be smaller than in its native state. This clearly demonstrates the mutual influence of core and shell swelling. 相似文献
430.