Relationships between quality of coals, resulting cokes, and micro-Raman spectral characteristics of these cokes

: Interactions of mantle silicates with subducted carbonates, sulfides, and sulfur-rich fluids are experimentally simulated in the olivine-ankerite-sulfur and olivine-ankerite-pyrite systems using a multi-anvil high-pressure split-sphere apparatus at 6.3 GPa and range of 1050–1550 °C. Recrystallization of Fe,Ni-bearing olivine and ankerite in a sulfur melt was found to be accompanied by sulfidation of olivine and carbonate, involving partial extraction of metals, carbon, and oxygen into the melt, followed by the formation of pyrite (±pyrrhotite), diopside, and Fe-free carbonates. The main features of metasomatic alteration of Fe,Ni-olivine by a reduced sulfur fluid include: (i) a zonal structure of crystals (Fe-rich core, Mg-rich rim); (ii) inclusions of pyrite and pyrrhotite in olivine; (iii) certain Raman spectral characteristics of olivine. At T > 1350 °C, two immiscible melts, a predominantly sulfur melt with dissolved components (or a Fe–Ni–S–O melt) and a predominantly carbonate one, are generated. The redox interaction of these melts leads to the formation of metastable graphite (1350–1550 °C) and diamond growth (1550 °C). The studied olivine-ankerite-sulfur and olivine-ankerite-pyrite interactions may be considered as the basis for simulation of metasomatic processes accompanied by the formation of mantle sulfides during subduction of crustal material to the silicate mantle.

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One-electron oxidation of the porphyrin ring of cobaltous octaethylporphyrin (CoIIOEP). Absorption and resonance Raman spectral characteristics of the CoIIOEP+.cntdot.ClO4- .pi.-cation radical

Journal of the American Chemical Society ◽

10.1021/ja00278a047 ◽

1986 ◽

Vol 108 (18) ◽

pp. 5630-5631 ◽

Cited By ~ 38

Author(s):

A. Salehi ◽

W. A. Oertling ◽

G. T. Babcock ◽

C. K. Chang

Keyword(s):

Spectral Characteristics ◽

Resonance Raman ◽

Cation Radical ◽

Porphyrin Ring ◽

Raman Spectral

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A spectroscopic study of the solvent dependent processes of the anils of benzaldehyde and salicylaldehyde

Canadian Journal of Chemistry ◽

10.1139/v82-236 ◽

1982 ◽

Vol 60 (13) ◽

pp. 1727-1737 ◽

Cited By ~ 32

Author(s):

Jerry W. Lewis ◽

Camille Sandorfy

Keyword(s):

Hydrogen Bond ◽

Ground State ◽

Spectral Characteristics ◽

Infrared And Raman Spectra ◽

Absorption Data ◽

Absorption Bands ◽

Visible Absorption ◽

Raman Spectral ◽

Dependent Processes ◽

Electronic Ground

The ultraviolet–visible, infrared, and Raman spectral characteristics of some anils of benzaldehyde and salicylaldehyde in several solvents have been investigated. The ultraviolet–visible absorption data indicate that in solvents with a proton donating ability less than or equal to trifluoroethanol a single equilibrium exists in solutions of N-(2-hydroxybenzylidene)aniline, whereas in solvents with a proton donating ability equal to or greater than hexafluoroisopropanol more than one equilibrium occurs. The infrared spectra of this compound dissolved in trifluoroethanol do not show new absorption bands in the 1700–1500 cm−1 region; however, new absorption bands in this region do appear when hexafluoroisopropanol is employed as solvent. From these data it is inferred that the first equilibrium involves the breaking of the chelate hydrogen bond and the second equilibrium involves actual protonation of N-(2-hydroxybenzylidene)aniline in the electronic ground state. A comparison of the infrared and Raman spectra of the title compounds is also made and alternate assignments for several observed bands in the 1700–1500 cm−1 region are proposed.

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Raman spectral characteristics of 4-aminobenzenethiol adsorbed on ZnO nanorod arrays

Physical Chemistry Chemical Physics ◽

10.1039/c3cp51204e ◽

2013 ◽

Vol 15 (23) ◽

pp. 9288 ◽

Cited By ~ 14

Author(s):

Kwan Kim ◽

Kyung Lock Kim ◽

Kuan Soo Shin

Keyword(s):

Spectral Characteristics ◽

Zno Nanorod ◽

Nanorod Arrays ◽

Zno Nanorod Arrays ◽

Raman Spectral

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Assessment the quality of apricots in the process of drying with neural networks and support vector machines

MATEC Web of Conferences ◽

10.1051/matecconf/201929203019 ◽

2019 ◽

Vol 292 ◽

pp. 03019

Author(s):

Mаrtin Dejanov ◽

Darinka Ilieva-Stefanova ◽

Iva Chelik

Keyword(s):

Neural Networks ◽

Spectral Characteristics ◽

Support Vector ◽

Carotene Content ◽

Color Features ◽

Rbf Kernel ◽

Linear Svm ◽

Lab Color Model ◽

Cie Lab

The paper presents an analysis of the assessment the quality of apricots during the drying process using two types of classifires: ANNs and SVMs. The quality of apricots is categorized in three classes according to the color and b-carotene content through the process of drying. The classification is made by using ‘CIE Lab’ color model and spectral characteristics in the VIS range. Neural networks are BPN and PNN, and classifiers are kernel and linear SVM. The spectral characteristics are pre-processed with SNV, MSC, First derivative and PCA. According to the results for color features, BPN and SVM with “rbf” kernel have the best performance while PNN has the worst performance. When using spectral characteristics the BPN network performs well: eavg = 4.1% and emax = 12.1% but the SVM linear (eavg = 3.4%, emax =5.3%) and SVM with “rbf” kernel (eavg = 2.4%, emax =5.2%) classifiers have better results. As a conclusion, it could be said that classifiers using spectral features perform well with errors at about 2-5%. Classification with color features is an alternative method, which is less complex, cheaper and with acceptable errors.

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PC‐based acquisition and processing of high‐resolution marine seismic data

Geophysics ◽

10.1190/1.1444096 ◽

1996 ◽

Vol 61 (6) ◽

pp. 1804-1812 ◽

Cited By ~ 8

Author(s):

Ho‐Young Lee ◽

Byung‐Koo Hyun ◽

Young‐Sae Kong

Keyword(s):

High Resolution ◽

Seismic Data ◽

Spectral Characteristics ◽

Processing System ◽

Band Pass Filter ◽

Pass Filter ◽

Optical Disk Drive ◽

Air Gun ◽

Marine Seismic

We have improved the quality of high‐resolution marine seismic data using a simple PC‐based acquisition and processing system. The system consists of a PC, an A/D converter, and a magneto‐optical disk drive. The system has been designed to acquire single‐channel data at up to 60,000 samples per second and to perform data processing of seismic data by a simple procedure. Test surveys have been carried out off Pohang, southern East Sea of Korea. The seismic systems used for the test were an air gun and a 3.5 kHz sub‐bottom profiling system. Spectral characteristics of the sources were analyzed. Simple digital signal processes which include gain recovery, deconvolution, band‐pass filter, and swell filter were performed. The quality of seismic sections produced by the system is greatly enhanced in comparison to analog sections. The PC‐based system for acquisition and processing of high‐resolution marine seismic data is economical and versatile.

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