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41.
A computer program for calculating activation analysis results is described. The program comprises two gamma spectrum analysis
programs, STOAV and SAMPO and one program for calculating elemental concentrations, KVANT. STOAV is based on a simple summation
of channels and SAMPO is based on fitting of mathematical functions. The programs are tested by analyzing the IAEA G-1 test
spectra. In the determination of peak location SAMPO is somewhat better than STOAV and in the determination of peak area SAMPO
is more than twice as accurate as STOAV. On the other hand, SAMPO is three times as expensive to use with a Cyber 170 computer
as STOAV. 相似文献
42.
Bobacka J Alaviuhkola T Hietapelto V Koskinen H Lewenstam A Lämsä M Pursiainen J Ivaska A 《Talanta》2002,58(2):341-349
Ion-selective electrodes (ISEs) based on pi-coordinating carriers were prepared and investigated as potentiometric sensors for aromatic cations, using N-methylpyridinium as a model aromatic cation. Derivatives of tetraphenylborate were studied as charged carriers in plasticized poly(vinyl chloride) membranes. Furthermore, neutral compounds containing pi-coordinating anthryl groups were studied as neutral carriers. Bis(2-ethylhexyl)sebacate (DOS) and 2-nitrophenyl octyl ether (o-NPOE) were used as non-polar and polar plasticizer, respectively. ISEs were constructed by using poly(3,4-ethylenedioxythiophene) (PEDOT) as solid-contact material. Conventional ISEs with internal filling solution were used for comparison. The potentiometric responses of the ISEs were investigated using N-methylpyridinium as primary ion. The results show that the selectivity of the ISEs is influenced significantly by both the plasticizer and the charged carriers, while the neutral carriers studied have only a minor influence on the selectivity. The role of cation-pi interactions between aromatic cations and the membrane components is discussed. 相似文献
43.
44.
Bolm C Rantanen T Schiffers I Zani L 《Angewandte Chemie (International ed. in English)》2005,44(12):1758-1763