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Last Updated: 09 September 2022

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Complex evaluation of Raman spectra using morphological filtering: algorithms, software implementation and experimental verification of baseline correction, peak recognition and cosmic ray removal in SERS spectra of designer drugs

With a single kernel, we discuss a complete u2010life Raman spectra with pronounced artifacts via mathematical morphology: baseline correction, peak detection, and cosmic ray removal are all included in a single kernel. Low-order morphological analysts The proposed therapy is based on peak-u2010oriented, with the use of contact points between a spectrum and its morphological mapping providing robust peak detection by low-u2010order morphological operators.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/jrs.6448


Asymptotic analysis of spectral problems in thick junctions with the branched fractal structure

The convergence of the spectrum of the corresponding nonstandard homogenized spectral disorder is established by Hausdorff, the leading terms of asymptotics are developed, and the appropriate asymptotic estimates are justified for the eigenvalues and eigenfunctions.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/mma.8692


Guanidinium and amide CEST mapping of human brain by high spectral resolution CEST at 3 T

With the high spectral resolution CEST combined with the polynomial Lorentzian line-u2010shape fitting, you can extract guanidinium and amide CEST on the human brain at 3 T MRI. To demonstrate the fitting range and the contributions to the amide and GuanCEST, NMR spectra on the egg white phantoms were obtained. To achieve multi-u2010CEST, two forms of CEST methodologies, including cw gradientu2010 and spin u2010echo, and steady state EPI, were used. GuanCEST can be extracted with the PLOF technique at 3 T, and the optimum B1=0. 6bcT B_1=0. 60. 2em T was found for GuanCEST in white matter and 1. 0 bcT in gray matter, as shown by the PLOF method in a 3 T. The amide and Guan CEST's coefficients of variation in both WM and GM for ssEPI are markedly higher than those of cwGRASE. Conclusion Guan and amide CEST mapping can be achieved by the HSRu2010CEST at 3 T combing with the PLOF technique.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/mrm.29440


Study of polycarbonate‐polystyrene interfaces using Scanning Transmission Electron Microscopy‐Spectrum Imaging (STEM‐SI)

Understanding bulk properties in multiphase polymeric materials requires knowledge of the materials' interfacial properties. Chemical microscopy by electron energyu2010loss spectroscopy in the transmission electron microscope is on trend to identify narrow polymer u2010polymer interfaces. We show how STEM+u2010SI can be used to determine the interfacial width in two immiscible polymers, using a polycarbonateu2010polystyrene bilayer as an example. We'll show how the interfacial profile concentrations can be determined by mapping peaks specific to each of the blend's constituents at several points along the interface. Higher spatial resolution can be achieved by using the technique described in this article with higher resolution EELS devices with improved signal-to-u2010 noise ratios. The procedure used here is capable of producing accurate visualization and morphological analysis of phase-u2010differentiated polymer blends using EELS chemical fingerprints of polymers that have been developed earlier.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/pi.6451

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions