Text of Unpublished Holograph Verses by C. Day Lewis

Smith, Stan

doi:10.1093/nq/36-2-207

Cited by 5 publications

(8 citation statements)

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“…The isomers, due to branching of the alkyl chain, elute at slightly different times along the retention time (x) axis, but, of course, at the same m/z value. In previous work, we have shown that branched chain isomers elute slightly before straight chain isomers [19]. At least two minor isomeric structures are chromatographically resolved from the main isomer.…”

Section: Examples Of Low-mw Polymer Separationsmentioning

confidence: 84%

“…polyethyleneglycol, or ethoxylate) chain capped by an alkyl chain on each end. Additional complexity is introduced by the fact that a variety of alkyl chain lengths are present, that the alkyl chains are present in a variety of isomers (that are chromatographically resolved, with branched isomers eluting before straight chain isomers [19]), that the capping alkyl chains are sometimes present as dimers, trimers, etc., and that unreacted starting material and other minor reaction byproducts are also present. Each species is represented by an ammonium adduct ion and a minor sodium adduct ion, with a very small protonated molecule.…”

Section: Examples Of Low-mw Polymer Separationsmentioning

confidence: 99%

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Characterization of low molecular weight alkoxylated polymers using long column SFC/MS and an image analysis based quantitation approach

Pinkston

Marapane

Jordan

et al. 2002

J. Am. Soc. Mass Spectrom.

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The utility of low viscosity mobile phases and long chromatographic columns for complex polymer analysis is demonstrated. We use long column supercritical fluid chromatography/ mass spectrometry (SFC/MS) with electrospray ionization (ESI) to characterize a variety of complex, low molecular weight polymers. When quantitative analysis is desired, the resulting three-dimensional (time, intensity, and mass-to-charge ratio [m/z]) data are converted to images. Custom image analysis software is used to detect and integrate peaks in arbitrarily defined regions of the time-m/z map. These integrated peak volumes can be used to quantitate distinct component classes of the polymer mixtures. (J Am Soc Mass Spectrom 2002, 13, 1195-1208

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Section: Examples Of Low-mw Polymer Separationsmentioning

confidence: 84%

Section: Examples Of Low-mw Polymer Separationsmentioning

confidence: 99%

Characterization of low molecular weight alkoxylated polymers using long column SFC/MS and an image analysis based quantitation approach

Pinkston

Marapane

Jordan

et al. 2002

J. Am. Soc. Mass Spectrom.

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“…Infrared spectroscopy did the trick (11). This then is an example of the utility of IR spectroscopy to distinguish similar materials from each other.…”

Section: Nylon 66 Versus Nylonmentioning

confidence: 99%

“…PLS finds the latent variables. These latent variables relate to the largest covariance between the signal and response matrices (9)(10)(11). In this context, PLS is considered another type of supervised learning.…”

Section: High-performance Raman Systems For a Range Of Applications I...mentioning

confidence: 99%

Efficient Discrimination of Some Moss Species by Fourier Transform Infrared Spectroscopy and Chemometrics

Cao¹,

Wang²,

Gao

et al. 2023

Spectroscopy

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Fourier-transform infrared (FT-IR) spectroscopy with the attenuated total reflectance (ATR) technique was used to classify 14 samples (11 species) from three moss families (Mielichhoferiaceae, Bryaceae, and Mniaceae). The FT-IR spectra ranging from 4000 cm−1 to 650 cm−1 of the 14 samples were obtained. To group the spectra according to their spectral similarity in a dendrogram, cluster analysis and principal component analysis (PCA) were performed. Cluster analysis combined with PCA was used to give a rough result of classification among the moss samples. However, some species belonging to the same genus exhibited very similar chemical components and similar FT-IR spectra. Discrete wavelet transform (DWT) was used to enhance the differences among species with similar chemical components and FT-IR spectra. Three scales were selected as the feature-extracting space in the DWT domain. Results showed that FT-IR spectroscopy combined with chemometrics was suitable for a systematic research classification of bryophytes.

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“…Attempts at deflation of the Lanczos or Davidson subspaces with the Nesbet eigenvector persistently failed, with inaccurate copies of the Nesbet eigenvector reappearing to contaminate the subspace. 21 As if this were not enough, the problem is exacerbated in the case of chemical reactions involving rapid interconversion between multiple deep-well isomeric species, because in these cases there are multiple small eigenvalues controlling the longtime kinetics.…”

Section: P(e|e )P(t; E ) De − ω + K(e) P(t; E)mentioning

confidence: 99%

Solving the unimolecular master equation with a weighted subspace projection method

Frankcombe

Smith

2000

J. Comput. Chem.

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Text of Unpublished Holograph Verses by C. Day Lewis

Cited by 5 publications

References 0 publications

Characterization of low molecular weight alkoxylated polymers using long column SFC/MS and an image analysis based quantitation approach

Characterization of low molecular weight alkoxylated polymers using long column SFC/MS and an image analysis based quantitation approach

Efficient Discrimination of Some Moss Species by Fourier Transform Infrared Spectroscopy and Chemometrics

Solving the unimolecular master equation with a weighted subspace projection method

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