Spectra process

Services - including programs for spectra processing and editing, manipulation with different types of data like samples compositions, terms of determination, analytical lines intensities. 

MHz, solvent CDC13 and homodecoupling spectra processing with sine bell function (sb = 1) tables with chemical shift in ppm and Hz for the determination of coupling constants... 

It was shown recently by Hung et al. [150] that the experiment also provides a straightforward way to separate completely <5Cs and <5qIS in the 2D graph, using a biaxial shearing transformation starting from the spectra processed previously in the conventional manner (80) ... 

Figure 10.13 Diesel NMR spectra processed with 700 Integral points obtained with an increment of 0.02ppm across a chemical shift range of 12 to -2 ppm. Basic chemistry functionality is also indicated.

Figure 9.30. A. Sn MAS NMR spectra of Sri -xTi,02 for samples of varying composition, heated at 800°C for 16 h. Spectra processed with side band suppression. From Kulshreshtha et al.

Measure and spectra processing (Spectrum module), this module applies different models, compares them and choose the most appropriate for the studied sample. Moreover, the module allows different spectrum calculation (spectrum shift, derivative, spectra addition, spectra subtraction),... 

Fluorimetric measurements were carried out with a commercial Hitachi F-4500 spec-trofluorometer equipped with a 150 W xenon lamp and interfaced to a personal microcomputer for instrument operation and spectra processing. The slit-widths were adjusted at 2.5 nm both for excitation and emission and the photomultiplier (PMT R-3788) voltage set to operate at 950 V. The synchronous fluorescence spectra were corrected for variations with wavelength of the lamp intensity and photomultiplier sensitivity. 

In this 3D NMR pulse sequence, two time increments, h and are successively incremented. Because of the J-coupling, each time increment leads to a modulation of the detected NMR signal. Shown here (Fig. 7.24) are simulated NMR spectra acquired at various time increments. A large array of these spectra, processed in total by 3D FFT, will lead to a cube of data, which is typically analyzed slice by sHce. 

Presenting nearly 50% new and revised material, this thoroughly updated edition incorporates the latest advances in instrumentation, computerization, calibration, and method development in NIR spectroscopy. The book underscores current trends in sample preparation, calibration transfer, process control, data analysis, and commercial NIR instrumentation. New chapters highlight novel applications including the analysis of agro-forestry products, polymers, blood, and control serum. They also cover NIR spectra, process analytical technologies (PAT), quantitative and qualitative analyses for nutraceuticals, NIR photography uses in medicine, and counterfeit detection methods for various applications. 

Table 7.12 shows some parameters of judgement for allowing the choice of a spectroscopic technique, whereas Table 7.13 compares NMR and NIRS for process analysis. Process NMR has potential for the selective determination of compounds containing certain nuclei. Despite the direct nature of the chemical information contained in NMR spectra process NMR (i.e. LR-NMR) is not widely used for chemical composition analysis. However, NMR can be used for the measurement of opaque, viscous and optically dirty samples, which can cause problems in IR methods. 

Gel-spun polyethylene is produced by DSM in cooperation with Toyobo (Dyneema) and Honeywell, formerly Allied Signal (Spectra). From the relevant patents it is fairly obvious that different solvents are used a volatile solvent in the Dyneema process and a nonvolatile solvent in the Spectra process. 

To minimize the effects of baseline variations due to Mie scattering, the ANN analysis was performed on second derivative spectra derived from the raw spectra processed using a Savitzky-Golay algorithm (nine points). 

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