Zobrazeno 1 - 10
of 74
pro vyhledávání: '"EDMUND R. MALINOWSKI"'
Autor:
Edmund R. Malinowski
Publikováno v:
Journal of Chemometrics. 25:323-328
Determining the rank of a chemical matrix is the first step in many multivariate, chemometric studies. Rank is defined as the minimum number of linearly independent factors after deletion of factors that contribute to random, nonlinear, uncorrelated
Autor:
Edmund R. Malinowski
Publikováno v:
Journal of Chemometrics. 23:1-6
Median absolute deviation (MAD) is a well-established statistical method for determining outliers. This simple statistic can be used to determine the number of principal factors responsible for a data matrix by direct application to the residual stan
Publikováno v:
Journal of Chemometrics. 21:520-528
The free flavin adenine dinucleotide (FAD) cofactor is known to exhibit a pH-dependent midpoint potential involving a simultaneous two-electron transfer step (n = 2). Uv-vis spectroelectrochemical reductions of FAD at constant pH, ranging from 5 to 9
Autor:
Edmund R. Malinowski
Publikováno v:
Journal of Chemometrics. 18:387-392
The statistical method developed by Vogt and Mizaikoff for the purpose of determining the number of principal factors responsible for a given test vector is adapted to determine the rank of the data matrix, i.e. the number of principal factors respon
Autor:
Mike Darj, Edmund R. Malinowski
Publikováno v:
Applied Spectroscopy. 56:257-265
Copper(II) is known to form a 2:1 complex with β-cyclodextrin in alkaline solution (pH ≥ 12), but its formation constant has not been determined. The present investigation involves the determination of the formation constant of the complex by spec
Autor:
Edmund R. Malinowski
Publikováno v:
Journal of Chemometrics. 16:54-67
Recently, a new chemometric technique called ‘transmutation’ has been designed to convert overlapping chromatographic bands into narrow bands, sufficient for resolving and quantifying the components. The ‘transmutation function’ is generated
Autor:
Zhouming Zhao, Edmund R. Malinowski
Publikováno v:
Applied Spectroscopy. 53:1567-1574
The visible spectra of methylene blue (MB) in aqueous-methanol solutions were used to determine the extent of hydration of MB aggregates. The investigation was carried out at MB concentrations of 1.000 × 10−4 M and 1.000 × 10−3 M. Abstract fact
Autor:
Edmund R. Malinowski
Publikováno v:
Journal of Chemometrics. 13:69-81
Chemical data gleaned from instrumental measurements, such as spectroscopy and chromatography, are often contaminated by multiple sources of error that vary during data collection. Abstract factor analysis (AFA) of such data invariably leads to an ex
Autor:
Zhouming Zhao, Edmund R. Malinowski
Publikováno v:
Journal of Chemometrics. 13:83-94
The aggregation of methylene blue (MB) in water was studied by factor analysis (FA) of the visible spectra over a wide range of concentration from 1.000 × 10 -7 to 1600 x 10 -2 M. Abstract factor analysis of data with multiple sources of error (AFA-
Autor:
Zhouming Zhao, Edmund R. Malinowski
Publikováno v:
Analytical Chemistry. 71:602-608
Fourier transform infrared absorption spectra, between 1850 and 2700 cm(-)(1), were used to study the intermolecular interactions between methanol and water. Digitized spectra obtained from methanol-water mixtures, with methanol mole fraction varying