Matches in SemOpenAlex for { <https://semopenalex.org/work/W1493199946> ?p ?o ?g. }
Showing items 1 to 59 of
59
with 100 items per page.
- W1493199946 abstract "The existence of free electrons in coals` natural state offers a great attraction for Electron Paramagnetic Resonance (EPR) analysis to aid in the study of the structure and composition of coal. This direct and non-destructive approach to coal analysis has been hindered by the problem of resolution using the conventional 9.5 GHz EPR spectrometers. In the past few years, the authors have developed techniques including W-band Very High Frequency EPR spectroscopy as a means of determining the quantity and structure of organic sulfur in native and desulfurized coals. The state-of-the-art 95 GHz (W-band) EPR spectrometer which they have constructed shows a well resolved spectrum including the interaction between unpaired electrons and the heteroatom like sulfur. The spectra also provide quantitative as well as qualitative information regarding different sulfur species. In this quarter, the authors have been concentrating their efforts on developing a new standard protocol in handling and preparing the coal samples for EPR measurements to provide a quantitative comparison between the EPR spectra of coal in the natural state and desulfurized. Sixteen new coal samples, both native and desulfurized, have been provided to us as well as to the University of Kentucky for analysis by XANES. These samples havemore » been run in both laboratories. The results from these samples, which were kept in an oxygen-free environment, are compared to those of 10 previous samples, which were air-oxidized. Significant differences in the EPR spectra of air-oxidized and oxygen free samples are noted; results from Kentucky are not yet available. Desulfurized samples show a significant decrease in organic sulfur as measured by the VHF-EPR method.« less" @default.
- W1493199946 created "2016-06-24" @default.
- W1493199946 creator A5005339214 @default.
- W1493199946 creator A5072089211 @default.
- W1493199946 date "1994-09-01" @default.
- W1493199946 modified "2023-10-18" @default.
- W1493199946 title "VHF EPR quantitation and speciation of organic sulfur in coal. Technical report, 1 March--31 May 1994" @default.
- W1493199946 doi "https://doi.org/10.2172/10183108" @default.
- W1493199946 hasPublicationYear "1994" @default.
- W1493199946 type Work @default.
- W1493199946 sameAs 1493199946 @default.
- W1493199946 citedByCount "0" @default.
- W1493199946 crossrefType "report" @default.
- W1493199946 hasAuthorship W1493199946A5005339214 @default.
- W1493199946 hasAuthorship W1493199946A5072089211 @default.
- W1493199946 hasBestOaLocation W14931999461 @default.
- W1493199946 hasConcept C107872376 @default.
- W1493199946 hasConcept C121332964 @default.
- W1493199946 hasConcept C178790620 @default.
- W1493199946 hasConcept C185592680 @default.
- W1493199946 hasConcept C187961010 @default.
- W1493199946 hasConcept C18903297 @default.
- W1493199946 hasConcept C2776838516 @default.
- W1493199946 hasConcept C39432304 @default.
- W1493199946 hasConcept C46141821 @default.
- W1493199946 hasConcept C518851703 @default.
- W1493199946 hasConcept C518881349 @default.
- W1493199946 hasConcept C86803240 @default.
- W1493199946 hasConceptScore W1493199946C107872376 @default.
- W1493199946 hasConceptScore W1493199946C121332964 @default.
- W1493199946 hasConceptScore W1493199946C178790620 @default.
- W1493199946 hasConceptScore W1493199946C185592680 @default.
- W1493199946 hasConceptScore W1493199946C187961010 @default.
- W1493199946 hasConceptScore W1493199946C18903297 @default.
- W1493199946 hasConceptScore W1493199946C2776838516 @default.
- W1493199946 hasConceptScore W1493199946C39432304 @default.
- W1493199946 hasConceptScore W1493199946C46141821 @default.
- W1493199946 hasConceptScore W1493199946C518851703 @default.
- W1493199946 hasConceptScore W1493199946C518881349 @default.
- W1493199946 hasConceptScore W1493199946C86803240 @default.
- W1493199946 hasLocation W14931999461 @default.
- W1493199946 hasLocation W14931999462 @default.
- W1493199946 hasLocation W14931999463 @default.
- W1493199946 hasOpenAccess W1493199946 @default.
- W1493199946 hasPrimaryLocation W14931999461 @default.
- W1493199946 hasRelatedWork W1970132168 @default.
- W1493199946 hasRelatedWork W2078698111 @default.
- W1493199946 hasRelatedWork W2095514261 @default.
- W1493199946 hasRelatedWork W2363075645 @default.
- W1493199946 hasRelatedWork W2364655575 @default.
- W1493199946 hasRelatedWork W2383607872 @default.
- W1493199946 hasRelatedWork W2899084033 @default.
- W1493199946 hasRelatedWork W3148439696 @default.
- W1493199946 hasRelatedWork W4229500319 @default.
- W1493199946 hasRelatedWork W4237091185 @default.
- W1493199946 isParatext "false" @default.
- W1493199946 isRetracted "false" @default.
- W1493199946 magId "1493199946" @default.
- W1493199946 workType "report" @default.