Results 311 to 320 of about 550,061 (354)

Volatile components of chayote

Phytochemistry, 1990
Abstract Using established procedures, volatile components of chayote were analysed for the first time. A total of 61 components ( ca 97% of the isolate) was positively identified, and a further four components ( ca 2%) were partially characterized.
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Pricing Volatility of Stock Returns With Volatile and Persistent Components

SSRN Electronic Journal, 2007
This paper introduces a two-component volatility model based on first moments of both components to describe the dynamics of speculative return volatility. The two components capture the volatile and the persistent part of volatility, respectively. The model is applied to 10 Asia-Pacific stock markets. Their in-mean effects on returns are tested.
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ECONOMETRIC ANALYSIS OF VOLATILITY COMPONENT MODELS

Econometric Theory, 2014
Volatility component models have received considerable attention recently, not only because of their ability to capture complex dynamics via a parsimonious parameter structure, but also because it is believed that they can handle well structural breaks or nonstationarities in asset price volatility.
Wang, Fangfang, Ghysels, Eric
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Volatile components in Andalusian vinegars

Zeitschrift für Lebensmittel-Untersuchung und -Forschung, 1987
The volatile fraction of different wine vinegars from Andalusia was studied, using gas chromatography. The identification of the peaks was based on the internal standard method. An outstanding content of volatile components was observed. High amounts were obtained for ethyl and methyl acetate as well as for isoamyl alcohols, which are the ...
Ana María Troncoso González, M. Guzmán Chozas   +1 more
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Volatile components of violet leaves

Phytochemistry, 1992
Abstract Volatile components of violet leaves were extracted with 1,1,2-trichloro-1,2,2-trifluoroethane as well as hexane and analysed using GC, GC-MS and GC-FTIR. Quantitatively, the yields of leave solids varied greatly according to the experimental parameters. Qualitatively, the chemical composition differs with respect to the solvent used.
Jian Qin Cu, Francis Perineau, Antoine Gaset   +2 more
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Volatile components of purple starthistle

Journal of Agricultural and Food Chemistry, 1990
Volatile components of purple starthistle (Centaurea calcitrapa L.) flowerhead buds, flowers, leaves, and stems were identified by gas chromatography-mass spectrometry. Of the 54 compounds identified, 49 were not previously reported in purple starthistle.
Ronald G. Binder, Charles E. Turner, Robert A. Flath   +2 more
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Volatile components of Manchego cheese

Journal of Dairy Research, 1991
SummaryVolatile components of four batches of Manchego cheese were studied throughout their ripening process. Samples were submitted to a micro simultaneous distillation-extraction procedure, and then analysed by capillary gas chromatography (GC) and combined GC and mass spectrometry.
Isabel Martínez-Castro, Jesus Sanz, Lourdes Amigo, Mercedes Ramos, Pedro Martín-Alvarez   +4 more
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Component-Driven Regime-Switching Volatility

Journal of Financial Econometrics, 2012
We develop a new class of regime-switching volatility models that are characterized by high-dimensional state spaces, parsimonious transition matrices, and ARMA dynamics for the log volatility process. This combination of features is achieved by assuming that we can decompose the Markov chain that describes regime dynamics into a number of two-state ...
Jeff Fleming, Chris Kirby
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Sampler of volatile components

2002
L'invention porte sur un échantillonneur de composés volatils qui combine des procédés de deshydratation et de desalcoolisaton pour produire un échantillon dans lequel ces produits sont absents. En amont de l'analyseur d'odeur, ledit échantillonneur de composés volatils permet d'éviter l'interférence de l'eau et de l'éthanol et d'améliorer la ...
Ragazzo, A., Baldet, Pierre, Ghommidh, Charles, Chalier, Pascale, Deratani, A., Boulet, J.C., Grenier, P., Crouzet, J., Chanie, E., Perrain, A.   +9 more
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Volatile components of bittermelon

Journal of Agricultural and Food Chemistry, 1989
Ronald G. Binder, Robert A. Flath, T. Richard Mon   +2 more
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