{"title":"多孔介质中多脉冲PFG扩散测量的有效扩散时间","authors":"E.J. Fordham , P.P. Mitra , L.L. Latour","doi":"10.1006/jmra.1996.0159","DOIUrl":null,"url":null,"abstract":"<div><p>Expressions for the effective diffusion times in multiple-gradient pulse diffusion measurements in liquid-saturated porous media are derived. This is necessary since the diffusion coefficient is time dependent. The results are needed for quantitative interpretation of the results of PFG diffusion measurements using the multiple-alternating-gradient schemes which are preferred for the majority of porous systems. The essence of the calculation and the results for “square” and “sine” pulse shapes have appeared previously, but without derivation. The details of this somewhat technical calculation may be needed by users.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"121 2","pages":"Pages 187-192"},"PeriodicalIF":0.0000,"publicationDate":"1996-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0159","citationCount":"30","resultStr":"{\"title\":\"Effective Diffusion Times in Multiple-Pulse PFG Diffusion Measurements in Porous Media\",\"authors\":\"E.J. Fordham , P.P. Mitra , L.L. Latour\",\"doi\":\"10.1006/jmra.1996.0159\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Expressions for the effective diffusion times in multiple-gradient pulse diffusion measurements in liquid-saturated porous media are derived. This is necessary since the diffusion coefficient is time dependent. The results are needed for quantitative interpretation of the results of PFG diffusion measurements using the multiple-alternating-gradient schemes which are preferred for the majority of porous systems. The essence of the calculation and the results for “square” and “sine” pulse shapes have appeared previously, but without derivation. The details of this somewhat technical calculation may be needed by users.</p></div>\",\"PeriodicalId\":16165,\"journal\":{\"name\":\"Journal of Magnetic Resonance, Series A\",\"volume\":\"121 2\",\"pages\":\"Pages 187-192\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1996-08-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1006/jmra.1996.0159\",\"citationCount\":\"30\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Magnetic Resonance, Series A\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S106418589690159X\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetic Resonance, Series A","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S106418589690159X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Effective Diffusion Times in Multiple-Pulse PFG Diffusion Measurements in Porous Media
Expressions for the effective diffusion times in multiple-gradient pulse diffusion measurements in liquid-saturated porous media are derived. This is necessary since the diffusion coefficient is time dependent. The results are needed for quantitative interpretation of the results of PFG diffusion measurements using the multiple-alternating-gradient schemes which are preferred for the majority of porous systems. The essence of the calculation and the results for “square” and “sine” pulse shapes have appeared previously, but without derivation. The details of this somewhat technical calculation may be needed by users.
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