Journal of Magnetic Resonance (1969)最新文献

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Assignment of 13C NMR spectra of solids using fast MAS with cross-polarization 交叉极化快速MAS对固体13C核磁共振谱的赋值
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90217-U
Waclaw Kolodziejski, Jacek Klinowski
{"title":"Assignment of 13C NMR spectra of solids using fast MAS with cross-polarization","authors":"Waclaw Kolodziejski, Jacek Klinowski","doi":"10.1016/0022-2364(92)90217-U","DOIUrl":"10.1016/0022-2364(92)90217-U","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 611-614"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90217-U","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90071355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetic resonance imaging—clinical principles 磁共振成像-临床原理
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90227-X
Anthony A Mancuso
{"title":"Magnetic resonance imaging—clinical principles","authors":"Anthony A Mancuso","doi":"10.1016/0022-2364(92)90227-X","DOIUrl":"10.1016/0022-2364(92)90227-X","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 671-672"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90227-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88736324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Heteronuclear transverse relaxation in AMX, AX2, and AX3 spin systems AMX、AX2和AX3自旋体系中的异核横向弛豫
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90218-V
Lewis E Kay , T.E Bull
{"title":"Heteronuclear transverse relaxation in AMX, AX2, and AX3 spin systems","authors":"Lewis E Kay , T.E Bull","doi":"10.1016/0022-2364(92)90218-V","DOIUrl":"10.1016/0022-2364(92)90218-V","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 615-622"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90218-V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79582179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 34
The 9 and 33 GHz EPR Spectra of Mn2+ impurity ions in polycrystalline calcite—Central transition 多晶方解石-中心转变中Mn2+杂质离子的9和33 GHz EPR谱
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90208-O
Y.P Zhang, H.A Buckmaster
{"title":"The 9 and 33 GHz EPR Spectra of Mn2+ impurity ions in polycrystalline calcite—Central transition","authors":"Y.P Zhang,&nbsp;H.A Buckmaster","doi":"10.1016/0022-2364(92)90208-O","DOIUrl":"10.1016/0022-2364(92)90208-O","url":null,"abstract":"<div><p>The 293 K EPR spectra of Mn<sup>2+</sup> impurity ions in polycrystalline natural and synthetic calcite and in the calcite impurity in various coal samples have been studied at 9.2 and 33.3 GHz. The spectra obtained at these two frequencies were found to differ dramatically. At 9.2 GHz, the lineshapes of the central transition hyperfine resonances are in good agreement with previous measurements. The 33.3 GHz EPR spectrum has some features which have not been reported previously at Mn<sup>2+</sup> concentrations below 1000 ppm. Computer simulation programs for both spin-Hamiltonian perturbation and diagonalization techniques were used to describe the mono- and polycrystalline spectra. It was found that the simulated spectrum using the spin-Hamiltonian diagonalization method agrees with previous 9.3 GHz monocrystal data within an error of 0.1 mT for the central transitions and of 0.13 mT for the noncentral transitions, whereas the simulation using the perturbation method had errors of 0.2 and 0.6 mT, respectively. An analysis of the polycrystalline hyperfine resonance lineshapes observed at 9.2 and 33.3 GHz for 1, 50, and 520 ppm Mn<sup>2+</sup> concentrations has been performed using both simulation methods. The hyperfine resonance lineshapes observed at 9.2 GHz are due to the magnetic field angular variation caused by the axial zero field splitting (ZFS) term <em>C</em><sub>0</sub><sup>2</sup>(<em>S</em>). The hyperfine resonance lineshapes observed at 33.3 GHz are shown to be due to the combined effect of A-tensor and g-tensor anisotropy, the axial ZFS, and the spin-spin interaction. The Mn<sup>2+</sup> impurity ion EPR spectrum observed in an Alberta coal and several Argonne coal samples is shown, using lineshape analysis, to originate from their calcite mineral impurity. The lineshape broadening observed in coal samples is characteristic of a strong spin-spin interaction and may be due to interactions with the free radicals and other impurity ions as well as between Mn<sup>2+</sup> ions.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 533-551"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90208-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88507243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Spectroscopy of polymers 聚合物光谱学
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90226-W
Kathryn R Williams
{"title":"Spectroscopy of polymers","authors":"Kathryn R Williams","doi":"10.1016/0022-2364(92)90226-W","DOIUrl":"10.1016/0022-2364(92)90226-W","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 669-670"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90226-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89281321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
B1-insensitive heteronuclear adiabatic polarization transfer for signal enhancement 用于信号增强的B1不敏感异核绝热极化转移
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90204-K
Hellmut Merkle, Haoran Wei, Michael Garwood, Kâmil Uǧurbil
{"title":"B1-insensitive heteronuclear adiabatic polarization transfer for signal enhancement","authors":"Hellmut Merkle,&nbsp;Haoran Wei,&nbsp;Michael Garwood,&nbsp;Kâmil Uǧurbil","doi":"10.1016/0022-2364(92)90204-K","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90204-K","url":null,"abstract":"<div><p>A new <em>B</em><sub>1</sub>-insensitive pulse sequence, BINEPT (for <em>B</em><sub>1</sub>-insensitive nuclear enhancement through <em>p</em>olarization transfer) is introduced that accomplishes signal enhancement for low-sensitivity nuclei through heteronuclear polarization transfer. Previously described methods for polarization transfer through <em>J</em>-ordered states such as INEPT [D. P. Burum and R. R. Ernst, <em>J. Magn. Reson</em>. <strong>39</strong>, 163 (1980)] require homogeneous <em>B</em><sub>1</sub> fields and carefully calibrated pulses to impart <span><math><mtext>π</mtext><mtext>2</mtext></math></span> and π rotations in order to achieve the maximum possible signal enhancement. In contrast, BINEPT, which is based on recently introduced adiabatic plane-rotation pulses, can induce the desired enhancement over a very large range of <em>B</em><sub>1</sub> magnitude and can be used even with surface coils that generate highly inhomogeneous <em>B</em><sub>1</sub> fields. BINEPT is not simply the INEPT sequence with the conventional pulses replaced with their adiabatic plane-rotation pulse analogs. Rather, it is based on the variable-angle, adiabatic BIR-4 pulse [M. Garwood and Y. Ke, <em>J. Magn. Reson</em>. <strong>94</strong>, 511 (1991)] and the principle that the evolution of spin states during intrapulse delays inserted in BIR-4 can determine the final rotation induced on magnetization vectors. The BINEPT technique is described theoretically in the rotating frame. Its performance is compared experimentally with INEPT using coils that generate homogeneous and inhomogeneous <em>B</em><sub>1</sub> fields.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 480-494"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90204-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72241680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Accuracy and precision in the estimation of in Vivo magnetic-resonance spectral parameters 体内磁共振谱参数估计的准确性和精密度
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90214-R
E.K.-Y Ho, R.E Snyder, P.S Allen
{"title":"Accuracy and precision in the estimation of in Vivo magnetic-resonance spectral parameters","authors":"E.K.-Y Ho,&nbsp;R.E Snyder,&nbsp;P.S Allen","doi":"10.1016/0022-2364(92)90214-R","DOIUrl":"10.1016/0022-2364(92)90214-R","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 590-595"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90214-R","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88575671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Structure and dynamics of bulk polymers by NMR methods 体聚合物的核磁共振结构和动力学
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90225-V
David L Vanderhart
{"title":"Structure and dynamics of bulk polymers by NMR methods","authors":"David L Vanderhart","doi":"10.1016/0022-2364(92)90225-V","DOIUrl":"https://doi.org/10.1016/0022-2364(92)90225-V","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 668-669"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90225-V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136548828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EPR resonator coupling monitor EPR谐振器耦合监视器
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90211-O
Richard W Quine, George A Rinard, Sandra S Eaton, Gareth R Eaton
{"title":"EPR resonator coupling monitor","authors":"Richard W Quine,&nbsp;George A Rinard,&nbsp;Sandra S Eaton,&nbsp;Gareth R Eaton","doi":"10.1016/0022-2364(92)90211-O","DOIUrl":"10.1016/0022-2364(92)90211-O","url":null,"abstract":"<div><p>A circular display of impedance (Smith Chart) is a convenient monitor of the impedance matching (coupling) of an EPR resonator to the microwave transmission line in the spectrometer. An implementation using inexpensive components is described that could be applied in a wide range of EPR spectrometers.</p></div>","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 571-575"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90211-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80034842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Semiempirical calculations of the dispersion contribution to the proton chemical shift 色散对质子化学位移贡献的半经验计算
Journal of Magnetic Resonance (1969) Pub Date : 1992-10-01 DOI: 10.1016/0022-2364(92)90216-T
Claude Giessner-Prettre , Nohad Gresh , Jacques Maddaluno
{"title":"Semiempirical calculations of the dispersion contribution to the proton chemical shift","authors":"Claude Giessner-Prettre ,&nbsp;Nohad Gresh ,&nbsp;Jacques Maddaluno","doi":"10.1016/0022-2364(92)90216-T","DOIUrl":"10.1016/0022-2364(92)90216-T","url":null,"abstract":"","PeriodicalId":100800,"journal":{"name":"Journal of Magnetic Resonance (1969)","volume":"99 3","pages":"Pages 605-610"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-2364(92)90216-T","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87330196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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