摘要:
A method for identifying a convolved peak is described. A plurality of spectra is obtained. A multivariate analysis technique is used to assign data points from the plurality of spectra to a plurality of groups. A peak is selected from the plurality of spectra. If the peak includes data points assigned to two or more groups of the plurality of groups, the peak is identified as a convolved peak. Principal component analysis is one multivariate analysis technique that is used to assign data points. A number of principal components are selected. A subset principal component space is created. A data point in the subset principal component space is selected. A vector is extended from the origin of the subset principal component space to the data point. One or more data points within a spatial angle around the vector are assigned to a group.
摘要:
The invention provides a method for grouping measurement data obtained by effecting two or more techniques to provide characterization data characterizing at least one sample with respect to characterizing substances. According to one aspect of the invention, the grouping is effected on the basis of at least one statistical distribution of deviations (Δm/zi) of a respective characterizing measurement value. According to another aspect of the invention, the grouping is effected on the basis of at least one collective characteristic of a plurality of respective quantitative measurement values (Ii).
摘要翻译:本发明提供了一种用于对通过实施两种或多种技术获得的测量数据进行分组的方法,以提供表征关于特征物质的至少一个样品的表征数据。 根据本发明的一个方面,基于相应特征测量值的偏差的至少一个统计分布(Deltam / zI i),进行分组。 根据本发明的另一方面,基于多个相应的定量测量值(I SUB)的至少一个集合特征进行分组。
摘要:
An embodiment of a method for real time material identification is described that comprises determining an approximate mass value for an unknown material from spectral information derived from mass spectral analysis of the unknown material; retrieving profile models that correspond to a known material from a data structure using the approximate mass value; fitting a sample profile for the unknown material from the spectral information to the profile models to generate a fit score for each fit, wherein the lowest fit score corresponds to the best fit; calculating a mass value from the best fitting profile model and the sample profile.
摘要:
A method for improving the chromatographic detection limit for an analyte including a) producing a chromatogram with a peak of the analyte, b) calculating a regression straight line for a baseline from measured values of a section without a peak in the chromatogram, c) calculating a regression function from measured values of the peak of the analyte, d) subtracting the regression function from the chromatogram, e) calculating a regression polynomial for the baseline from the values of the chromatogram which have been changed in step d), calculating a further regression function from the measured values of the peak in the produced chromatogram, g) calculating a peak area between the regression polynomial and the further regression function, h) repetition of step d) with the further regression function instead of the regression function and of steps e), f) and g), until the calculated peak area changes by less than a predetermined amount.
摘要:
The Invention is a method for quantitative analysis of a mixture of molecular compounds by two-dimensional gas chromatography having application for quantitative analysis of products from the chemical or petroleum industry. A two-dimensional gas chromatography is carried out, during which a chromatographic signal is recorded. A chromatogram in two dimensions on which chromatographic peaks form spots is generated from the signal. These spots are defined by means of polygons. Then, for each polygon, chromatographic signal portions contained between two intersections of the polygon with columns of the chromatogram are extracted. Start and end times are defined for the chromatographic peaks present in these portions and the polygon is adjusted by shifting its intersection points according to the start and end times of the chromatographic peaks. Finally, molecular compound amounts are determined by calculating the surface area of the polygons thus adjusted.
摘要:
An apparatus for analyzing spectral data of a mixture having a plurality of components by determining the pure variables, each of which has a contribution from only one of the mixture components, includes a programmed computer for performing steps of a) providing spectral data of the mixture, b) determining purity values of variables from said data to provide a first purity spectrum, c) finding the maximum of the purity values to determine the first pure variable, d) calculating a determinant-based weight function with respect to said first pure variable, e) multiplying the first purity spectrum by the determinant-based weight function to provide a second purity spectrum, f) finding the maximum in the second purity spectrum to yield the second pure variable, g) repeating steps d),e) and f) for successive determinant-based weight functions with respect to preceding pure variables to provide successive purity spectra from which successive pure variables are found. The pure variables so determined are compared and the results of the comparison used control a process in which the mixture undergoes a reaction.
摘要:
An evaluating apparatus for a pattern includes a FP preparing part preparing a target FP at a specific detection wavelength from a 3D chromatogram of a multicomponent material being an evaluation target, a peak pattern preparing part preparing a peak pattern for each peak of the target reference FPs that comprises n+1 peaks including n peaks being present on at least one of sides located in front and in the rear of each peak in a time axis direction, a peak assigning part specifying the corresponding peaks by comparison of the peak patterns and UV spectra of the peaks, and an evaluating part evaluating the assigned peaks by comparison with peaks of a plurality of reference FPs.
摘要:
The Invention is a method for quantitative analysis of a mixture of molecular compounds by two-dimensional gas chromatography having application for quantitative analysis of products from the chemical or petroleum industry. A two-dimensional gas chromatography is carried out, during which a chromatographic signal is recorded. A chromatogram in two dimensions on which chromatographic peaks form spots is generated from the signal. These spots are defined by means of polygons. Then, for each polygon, chromatographic signal portions contained between two intersections of the polygon with columns of the chromatogram are extracted. Start and end times are defined for the chromatographic peaks present in these portions and the polygon is adjusted by shifting its intersection points according to the start and end times of the chromatographic peaks. Finally, molecular compound amounts are determined by calculating the surface area of the polygons thus adjusted.
摘要:
The invention provides a method for grouping measurement data obtained by effecting two or more techniques to provide characterization data characterizing at least one sample with respect to characterizing substances. According to one aspect of the invention, the grouping is effected on the basis of at least one statistical distribution of deviations (Δm/zi) of a respective characterizing measurement value. According to another aspect of the invention, the grouping is effected on the basis of at least one collective characteristic of a plurality of respective quantitative measurement values (Ii).
摘要翻译:本发明提供了一种用于对通过实施两种或多种技术获得的测量数据进行分组的方法,以提供表征关于特征物质的至少一个样品的表征数据。 根据本发明的一个方面,基于各个特征测量值的偏差(&Dgr; m / zi)的至少一个统计分布进行分组。 根据本发明的另一方面,基于多个相应的定量测量值(Ii)的至少一个集合特征进行分组。
摘要:
Deconvolution of up to three overlapping chromatographic peaks is provided in which pure spectral components are extrapolated from a Euclidean-normalized expression of chromatographic data in the space of the three principal factors. A coordinate transformation to planar coordinates after expansion in factor space and before extrapolation yields the simplicity of linear extrapolation in combination with the inherent accuracy of Euclidean, as opposed to standard, normalization. The estimation of the pure component spectra permits the constructions of a concentration matrix. Improved estimates and an error bound are provided by applying assumptions of non-negativity and limited deviation from the means to the concentration matrix.