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31.
Mössbauer spectra of amorphous FexNi80- x Si10B10 (x=10,50) and Fe80B20 have been taken at 4.2-300K and in 0-6T applied magnetic fields. Detailed analysis shows that the standard deviation of the magnetic hyperfine field σ(B) varies with temperature depending on the iron concentration. For small x the variation is taken as evidence for a break-down of long-range magnetic order. Temperature induced changes in the fluctuations and correlations of the hyperfine parameters are reported. In all cases the isomer shift fluctuations are small compared to those of the first-order electric quadrupole splitting (u); neither are strongly temperature dependent. The correlation <ΔBΔu> is negative and increases with temperature. For Fe80B20, <ΔBΔδ> is positive and increases with temperature, whereas for Fe-Ni-Si-B it is small, negative, and temperature invariant. 相似文献
32.
An automated method for determining the iodine value for various industrial fatty acids is described. The method is based on flow-injection techniques and the chemistry is a modified version of the standard Wij's solution method. The system is fully computerized with an AIM-65 microcomputer. Two detection system, u.v.-visible absorbance and potentiometric sensing, are compared. Results comparable to the conventional method are obtained. Continuous-run sample throughput rates of 12 h?1 are eralistic. 相似文献
33.
R. J. Pollard 《Hyperfine Interactions》1988,41(1):509-512
High quality Mössbauer spectra of γ-Fe2O3 particles have been analyzed in detail to determine the effects of overlapping patterns, quadrupole splitting, and applied magnetic fields. The results are discussed with regard to the use of Mössbauer spectroscopy to measure particle and magnetic moment orientation. Data were collected from two samples at 4.2–315K and with 6.1T longitudinal and 1.65T transverse magnetic fields applied. It is shown that electric field gradient effects alone are insufficient to account for the presence of ΔmI=0 lines when a large longitudinal field is applied. 相似文献
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A survey of the metal-complexing reactions, as determined by reactions on chromatography paper, of 44 compounds with a substituted or modified 4-(2-pyridylazo)-resorcinol (PAR) or 1-(2-pyridylazo)-2-naphthol (PAN) structure is reported. 相似文献
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The limits of identification of twenty six common cations, with a selected number of spray reagents used in paper chromatography, have been determined. A table of the most sensitive tests is given. 相似文献
38.
J. M. Pollard 《BIT Numerical Mathematics》1979,19(4):545-548
We describe a novel form of Monte Carlo method with which to study self-avoiding random walks; we do not (in any sense) store the path of the walk being considered. As we show, the problem is related to that of devising a random-number generator which can produce itsnth number on request, without running through its sequence up to this point. 相似文献
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Synaptic vesicles: structure of chromaffin granule membranes 总被引:2,自引:0,他引:2