Authors:Z. Dawa, Y. Zhou, Y. Bai, S. Gesang, J. Liang, and L. Ding
An HPLC-DAD-ESI-MSn method has been developed for simultaneous quantification of eight major compounds in eight Saussurea species which have long been used as the traditional Tibetan medicines. The method was validated for sensitivity, precision, and accuracy. LODs were from 0.11 to 5.01 μg mL−1, overall intra-day and inter-day variation was less than 2.70%, and overall recovery was over 98.0%. The correlation coefficients (r2) of the calibration plots were >0.991. This newly established method was successfully used to reveal difference among the chemical profiles and analytes contents of eight Saussurea species collected in Tibet. In addition, by comparison of UV and mass spectra with those of authentic compounds, a total of fifteen peaks were identified. It can be concluded that this is an effective method for quantification and evaluation of the flavonoids and coumarins in the eight species of the genus Saussurea. It can be used as an efficient reference method for development and use of the eight traditional Tibetan medicines by comparing their different characteristics.
Based on the general mathematical model of Dudás [3, 4] — which is appropriate for mathematical modelling of production technology methods and various toothed gear pairs — we have generated mathematical models which are appropriate for determination of tooth surface points of face gear and worm gear connection with conical and cylindrical worm by numerical way. After doing the necessary calculations, the CAD models of the worm gear drives could be generated. Based on these there is an opportunity for rapid prototyping (RP) technology for other connection and production geometric analysis.
For the verification of our calculated results, we generate CAD models of one to one given geometric conical and cylindrical worm gear drives for other analysis.
, R. (2000): Globalization and unequalisation: what can be learned from value chain analysis?
Journal of Development Studies.
Vol. 37. No. 2, 117–146.
Kaplinsky, R. – Morris, M. (2008): A handbook for value chain
The opening of Haydn’s Symphony No. 39 in G minor is interrupted by two unusually long grand pauses. These brief suspensions of the time continuum reveal Haydn’s search for new narrative strategies for a genre caught up in the tensions between the boisterous concert opener, courtly representation, the bourgeois concert hall and the demands of “connoisseurs.” This use of the
points toward a period of upheaval in the development of symphonic forms in the 18th century. A comparative analysis examining the primarily “punctuated” concept of form in the 18th century in relation to the primarily thematic concept of form in the 19th century and the synthesis of both in the writings of Anton Reicha can show that the process of developing formal functions becomes especially acute in Haydn’s Symphony No. 39, with the two grand pauses playing a key role. Such a reading of Haydn, which seeks to reconcile “historically informed” analysis with emphatic interpretation, illustrates how the spectacular grand pauses in the Symphony No. 39 can suggest a brief suspension of not only the work’s own immanent time but the historical time of 18th-century music history.
Kaplan, Richard A. 'Temporal fusion and climax in the symphonies of Mahler', The journal of musicology: A quarterly review of music history, criticism, analysis, and performance practice 14/2, Spring 1996, 213
Authors:Alexandre G. S. Prado, Rômulo D. A. Andrade, Jez W. B. Braga, and Paulo A. Z. Suarez
data is less common than in spectroscopy. Examples of works in this research field can be found by applying exploratory and pattern recognition methods such as principal component analysis (PCA) to study the effects of chemicals on cellulose pyrolysis