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231.
Thermoluminescence emission spectra of CaF2:Tm (TLD-300) samples irradiated with 48 keV X-rays 60Co gamma rays, 4.5 MeV alpha particles and 15 MeV neutrons were measured in the 300–650 K temperature region. Seven emission bands were observed of which the one in the infrared (at 803 nm) is very intense. The emission bands can be assigned to 1D, 1G, 3F and 3H levels characteristic for Tm3+ de-excitation in a cubic field. All observed lines in the spectrum are due to 4f-4f transitions. The spectra undergo remarkable changes in intensity when the temperature is raised from room temperature up to 350°C, while the number of the emission bands remains constant. The glow curve structure is both dependent on emission wavelength and the type of radiation. Evidence has been found that the trapping structures responsible for glow peaks 2 and 3 alter under the influence of high LET () radiation. For glow peaks 4–6 the filling of the traps alters with the type of radiation. The observations can be explained assuming a TL process involving several hole trapping centres but with only one luminescent centre (Tm3+) active at all temperatures. 相似文献
232.
B. Zygmunt H. B. Hanekamp P. Bos R. W. Frei 《Fresenius' Journal of Analytical Chemistry》1982,311(3):197-200
Summary A polarographic detector with a horizontal, fast dropping mercury electrode has been applied for the determination of thiols in physiological fluids. To establish suitable detection conditions first some basic studies on the polarographic behaviour of penicillamine, glutathione and cysteine were performed. This type of detection shows a high selectivity and reasonably low detection limits for sulphhydryl compounds. Detection limits of 6×10–7 mol l–1 for penicillamine and cysteine and 8×10–7 mol l–1 for glutathione were found. A good linearity has been observed over a concentration range of three orders. The detector has successfully been applied to the determination of penicillamine in urine and serum samples.
Dedicated to Prof. Dr. H. Weisz on occasion of his 60th birthday
On leave from the Technical University of Gdansk 相似文献
Bestimmung von Sulfhydrylverbindungen in physiologischen Flüssigkeiten durch Flüssigkeits-Chromatographie mit polarographischer Detektion
Zusammenfassung Ein polarographischer Detektor mit horizontaler, schnell tropfender Quecksilberelektrode wurde zur Bestimmung von Thiolen in physiologischen Flüssigkeiten angewendet. Zur Feststellung geeigneter Bedingungen wurden zunächst grundlegende Untersuchungen zum polarographischen Verhalten von Penicillamin, Glutathion und Cystein durchgeführt. Das Verfahren bietet hohe Selektivität und niedrige Nachweisgrenzen (6 · 10–7 mol/l für Penicillamin und Cystein, 8 · 10–7 mol/l für Glutathion). Linearität besteht über drei Größenordnungen. Der Detektor wurde mit gutem Erfolg für die Penicillaminbestimmung in Harn und Serum verwendet.
Dedicated to Prof. Dr. H. Weisz on occasion of his 60th birthday
On leave from the Technical University of Gdansk 相似文献
233.
M. Bos 《Analytica chimica acta》1982,135(2):249-261
234.
Prof. Werner Bos 《Mathematische Zeitschrift》1972,128(3):207-216
Ohne Zusammenfassung 相似文献
235.
W. E. van der Linden M. Bos H. H. Heskamp H. Wilms 《Fresenius' Journal of Analytical Chemistry》1987,329(4):440-443
Summary A flow injection manifold is described based on a flow-through arrangement of thermistors for measuring heat effects of chemical reactions. Temperature changes down to 10–3 °C can be measured reproducibly. The working range for the determination of a component is dependent on the reaction enthalpy and can vary from 10–3 to 10 mol/l for acids and bases, from 10 to 1000 ppm for e.g., alkylhydroperoxides. Sample frequencies up to 150 samples per hour can be realized.
Einige Anwendungen der enthalpimetrischen Detektion in der Fließinjektionsanalyse相似文献
236.
We establish a new formula for Kergin interpolation in the plane and use it to prove that the Kergin interpolation polynomials
at the roots of unity of a function of classC
2 in a neighborhood of the unit disc
converge uniformly to the function on
. 相似文献
237.
238.
Facile Surfactant‐Free Synthesis of p‐Type SnSe Nanoplates with Exceptional Thermoelectric Power Factors
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Dr. Guang Han Dr. Srinivas R. Popuri Dr. Heather F. Greer Dr. Jan‐Willem G. Bos Prof. Wuzong Zhou Prof. Andrew R. Knox Dr. Andrea Montecucco Dr. Jonathan Siviter Dr. Elena A. Man Dr. Martin Macauley Prof. Douglas J. Paul Prof. Wen‐guang Li Dr. Manosh C. Paul Dr. Min Gao Dr. Tracy Sweet Prof. Robert Freer Dr. Feridoon Azough Dr. Hasan Baig Dr. Nazmi Sellami Prof. Tapas K. Mallick Prof. Duncan H. Gregory 《Angewandte Chemie (International ed. in English)》2016,55(22):6433-6437
A surfactant‐free solution methodology, simply using water as a solvent, has been developed for the straightforward synthesis of single‐phase orthorhombic SnSe nanoplates in gram quantities. Individual nanoplates are composed of {100} surfaces with {011} edge facets. Hot‐pressed nanostructured compacts (Eg≈0.85 eV) exhibit excellent electrical conductivity and thermoelectric power factors (S2σ) at 550 K. S2σ values are 8‐fold higher than equivalent materials prepared using citric acid as a structure‐directing agent, and electrical properties are comparable to the best‐performing, extrinsically doped p‐type polycrystalline tin selenides. The method offers an energy‐efficient, rapid route to p‐type SnSe nanostructures. 相似文献
239.
The pKa value of hydriodic acid in 1,2-dichloroethane was determined from conductivity measurements. A glass electrode was calibrated for dichloroethane in the potentiometric titration of hydriodic acid with tetramethylguanidine. From potentiometric titrations, the pKa values in dichloroethane of hydrobromic acid, hydrochloric acid, picric acid and some sulfonphthaleins as well as some protonated nitrogen bases were determined. In the curves of the titrations of the carboxylic acids and the hydrogen halides with TMG, evidence was found for the formation of the complex B(HX)2. 相似文献
240.
The dispersion behaviour of the various individual parts making up a flow-injection manifold is often difficult to establish because it is virtually impossible to obtainthe required very small injection and detection volumes. It is shown that it is possible, under suitable experimental conditions, to find the impulse/response functionof each component by means of a deconvolution process of the response functions have been established, the response function of any arrangement can be predicted by convoluting the impulse/response functions of all the individuaol parts involved. Convolution and deconvolution were done in the Fourier domain, by using a fast FT algorithm. 相似文献