Interlaboratory comparison of cosmogenic 21 Ne in quartz

comparison of catalytic activity of heteropoly compounds in the synthesis of bis(indolyl)alkanes.

heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...

Measurement of the 21 Ne Zeeman frequency shift due to Rb- 21 Ne collisions

Interlaboratory comparison of simmondsin analysis

Eleven samples containing various amounts of simmondsin (S), simmondsin ferulate (SF), demethyl simmondsins (DMS) and didemethyl simmondsins (DDMS) were analyzed by five different laboratories. The samples were made from chromatographically pure simmondsin, animal feed formulations containing jojoba meal, defatted jojoba meal, water extracts of jojoba meal and combinations of these ingredients....

comparison of the amount of debris extruded apically in two rotary techniques: flexmaster and m2

چکیده ندارد.

Preliminary Results for the Extraction and Measurement of Cosmogenic in Situ 14c from Quartz

Radiocarbon is produced within minerals at the earth’s surface (in situ production) by a number of spallation reactions. Its relatively short half-life of 5730 yr provides us with a unique cosmogenic nuclide tool for the measurement of rapid erosion rates (>10–3 cm yr–1) and events occurring over the past 25 kyr. At SUERC, we have designed and built a vacuum system to extract 14C from quartz wh...