原理包括化学位移和自旋耦合。
给出了该化合物的化学位移数据。
根据取代基对各类质子化学位移变化的影响。
On basis of the effect of substituents on the variation of the chem.
最后，还介绍了单晶化学位移张量的常规测量方法。
The common methods for measuring single crystal chemical shielding tensor are also discussed.
次级化学位移；
并讨论了苯环上不同取代基对冠醚环上各碳化学位移的影响。
The influences of benzine ring's different sub-stituets on the chemical shifts of crown's carbons are also discussed.
结果：13例具有化学位移伪影的病灶均证实含有脂肪成分；
Results: In 13 cases the lesions with chemical shift artifacts all contain fat;
与二磷烯比较，分析了它们在核磁共振磷谱中化学位移的变化。
Their changes in 31 P NMR chemical shift compared with diphosphene compounds are analyzed.
这些化学位移与指纹相似，能够告诉我们有关该结构的某些情况。
These chemical shifts are like fingerprints that tell us something about the structure.
脊椎；化学位移成像；同相位；反相位；磁共振成像；信号强度。
Magnetic resonance imaging; in phase; Opposed phase; Signal intensity; VertebraL; Chemical shift.
本文介绍在FX系列NMR谱仪上完成一维异核化学位移相关实验的方法。
A method for one-dimensional heteronuclear chemical-shift correlation experiments on a FX-series NMR spectrometer is introduced.
对于成对的化合物，酰胺氮上质子的化学位移及紫外光谱亦有助于判断构型。
For the pairs of these compounds, the chemical shifts of protons on amide nitrogen and the UV spectra arc helpful for assigning configuration.
结论：化学位移序列在鉴别脊柱单纯性和病理性压缩骨折方面有较高的应用价值。
Conclusion:Chemical shift technique is helpful to distinguish benign and pathologic vertebral compression fracture.
既然富烯不显示环电流存在的迹象，所以质子的化学位移仍然发生在正常的链烯区。
Since fulvenes show no evidence of ring currents, the chemical shifts of the protons will be found in the normal definite region.
结论在化学位移成像图像上，正常椎体信号强度下降指数会呈现出一定程度的变化。
Conclusion there was some variability in the loss of signal intensity according to location (spinal segment), and there were associations between decreases in signal intensity and age.
目的通过对包甲素类似物nmr谱的分析，考察其结构差别对共振信号化学位移的影响。
Objective By analyzing the NMR spectra of analogs of Baogongteng a, tropane alkaloids, the effects of structural variations on chemical shifts of resonance signals were investigated.
采用规范不变原子轨道GIAO法，计算它们的1H-NMR和13C-NMR化学位移值。
With the GIAO (gauge-independent atomic orbital) method, the 1H-NMR and 13C-NMR were also calculated theoretically.
在此基础上讨论了溶液中样品的结构、取代基对其结构、构象的影响和取代基的化学位移规律。
The structure of samples in solution, the influence of R-substitution on conformation, and the rule of R-substituted chemical shifts were discussed.
对所有共振谱线进行了全面归属，并讨论了不同取代基和环内不同杂原子对化学位移值的影响。
All of the resonance lines were fully assigned and the effects of substituents and heteroatoms in ring on chemical shifts were discussed.
指出，共振核—CF 2—的化学位移不仅受第一、二邻位基团的影响，也受第三邻位的影响。
These results indicated that the chemical shifts of central -cf2 - group are not only affected by the first and the second neighboring groups, but also by the third neighboring group.
测定了12个标题化合物的核磁共振谱，报道了它们的1h和13C化学位移以及定量分析数据。
NMR spectra of 12 titled compounds are determined. The chemical shifts of 1h and 13c and the data of quantitative analysis are reported.
本文首次将反向传播(BP)神经网络理论应用于13cNMR对1h nmr化学位移值的预测。
The Back Propagation (BP) neural network theory is first used to predict the relation between the data of 1h NMR and 13c NMR.
方法样品经溶解、降解处理后，测定1h -NMR图谱，根据氢的化学位移和响应值，计算样品的脱乙酰度。
METHODS After being dissolved and depolymerized, the sample was determined by 1h-nmr. From the chemical shifts and the intensities of resonances of protons, the degree of deacetylation was determined.
目的：评价SPIR(用于化学位移脂肪抑制的频谱预饱和反转复位技术)与造影增强联合应用在眼眶病变判断中的作用。
Purpose: To evaluate the role of SPIR (a chemical shift fat suppression technique) in the evaluation of orbital lesions, especially when used in conjunction with contrast enhancement.
目的：评价SPIR(用于化学位移脂肪抑制的频谱预饱和反转复位技术)与造影增强联合应用在眼眶病变判断中的作用。
Purpose: To evaluate the role of SPIR (a chemical shift fat suppression technique) in the evaluation of orbital lesions, especially when used in conjunction with contrast enhancement.
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