scholarly journals Characterization of Microstructural Changes on Biglycan Induced Mice Bone by Low-Field Nuclear Magnetic Resonance

2021 ◽  
Vol 4 (2) ◽  
pp. 58
Author(s):  
Ni Qingwen ◽  
Hua Rui ◽  
Douglas Holland ◽  
Anahi Tinajero ◽  
Han Yan ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Microstructural Changes ◽  
Low Field ◽  
Nuclear Magnetic

scholarly journals Characterization of moisture in acetylated and propionylated radiata pine using low-field nuclear magnetic resonance (LFNMR) relaxometry

Holzforschung ◽  
2018 ◽  
Vol 72 (3) ◽  
pp. 225-233 ◽  
Author(s):  
Greeley Beck ◽  
Emil Engelund Thybring ◽  
Lisbeth Garbrecht Thygesen ◽  
Callum Hill
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Cell Wall ◽  
Magnetic Resonance ◽  
Relaxation Times ◽  
Radiata Pine ◽  
Saturation Point ◽  
Weight Percentage ◽  
Low Field ◽  
Nuclear Magnetic

AbstractMoisture in radiata pine (Pinus radiataD. Don) earlywood (EW), which was acetylated or propionylated to various degrees, was measured by low-field nuclear magnetic resonance (LFNMR) relaxometry. Spin-spin relaxation times (T2) were determined for fully saturated samples at 22 and −18°C.T2values for EW lumen water increased with increasing acetylation weight percentage gain (WPG), perhaps caused by the less hydrophilic acetylated wood (AcW) surface. Cell wall water (WCW) and the water in pits and small voids also showed increasingT2values as a function of WPG but with a weaker tendency. A possible explanation is the counteracting effects of decreased hydrophilicity and reduced moisture content (MC) of these water populations at higher levels of acetylation. The evaluation of propionylation on WCWT2data was complicated by peak splitting in the relaxation spectrum. ConstantT2values for void water populations at various WPG levels for propionylated samples indicate a modification gradient in the cell wall. Fiber saturation point (FSP) was significantly reduced by both modifications. Slightly higher FSP values for propionylated samples suggest that physical bulking is not the only factor causing moisture exclusion in AcW. But this interpretation is tentative because of the possibility of cell wall damage caused by propionylation.

Characterization of water state and distribution in fibre materials by low-field nuclear magnetic resonance

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11492-11500 ◽  
Author(s):  
Peng Ji ◽  
Jin Jin ◽  
Xianglin Chen ◽  
Chaosheng Wang ◽  
Huaping Wang
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nmr Method ◽  
Low Field ◽  
Water State ◽  
Lf Nmr ◽  
Nuclear Magnetic

The states of absorbed water in the cotton and PET fibres materials characterized by LF-NMR method.

Application of Low-Field Nuclear Magnetic Resonance (LFNMR) in Characterizing Coal Pores and Permeability

2013 ◽  
Vol 718-720 ◽  
pp. 1012-1017 ◽  
Author(s):  
Jun Gang Liu ◽  
Da Meng Liu ◽  
Yan Bin Yao ◽  
Jian Guo Wu ◽  
Jun Qian Li
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coal Sample ◽  
Surface Relaxivity ◽  
Nmr Parameters ◽  
Low Field ◽  
The Difference ◽  
Coal Reservoir ◽  
Nuclear Magnetic

Low-field nuclear magnetic resonance (LFNMR) is a rapid, nondestructive analytical method which has been proved to be attractive for its application in brittle and easily compressed coals. In this paper, the relationships between NMR parameters and coal pores were analyzed by the NMR measurements of six coal samples with different ranks using AniMR with the resonance frequency of 12.15MHz. Results show that NMR porosity usually compare well to water porosity and be lower than He porosity, and the NMR porosity at echo spacing of 0.3ms sometimes underestimates the coal sample, lower than water porosity by >1 porosity unit. In contrast, the NMR porosity at echo spacing of 0.1ms is acceptable for characterization of coal reservoir. The difference of NMR porosity at different echo spacing may relate to the vitrinite content. Based on the T2c model, the transverse surface relaxivity of coal is calculated and it ranges from 0.25 to 20 um/s, commonly lower than 5um/s. The producible porosity could be a parameter used to estimate coal permeability, however there still needs a lot of work to construct a perfect method for this.

scholarly journals Low-Field Nuclear Magnetic Resonance Characterization of Carbonate and Sandstone Reservoirs From Rock Spring Uplift of Wyoming

2018 ◽  
Vol 123 (9) ◽  
pp. 7444-7460 ◽  
Author(s):  
Heng Wang ◽  
Vladimir Alvarado ◽  
J. Fred McLaughlin ◽  
Davin A. Bagdonas ◽  
John P. Kaszuba ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Low Field ◽  
Sandstone Reservoirs ◽  
Nuclear Magnetic

Petrophysical characterization of coals by low-field nuclear magnetic resonance (NMR)

Fuel ◽  
2010 ◽  
Vol 89 (7) ◽  
pp. 1371-1380 ◽  
Author(s):  
Yanbin Yao ◽  
Dameng Liu ◽  
Yao Che ◽  
Dazhen Tang ◽  
Shuheng Tang ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Low Field ◽  
Nuclear Magnetic
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