Log in

Relevant bibliographies by topics / NMR Measurements / Journal articles

To see the other types of publications on this topic, follow the link: NMR Measurements.

Journal articles on the topic 'NMR Measurements'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'NMR Measurements.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Caprihan, A., and E. Fukushima. "Flow measurements by NMR." Physics Reports 198, no. 4 (1990): 195–235. http://dx.doi.org/10.1016/0370-1573(90)90046-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Rollwitz, William. "4701705 NMR moisture measurements." Magnetic Resonance Imaging 6, no. 4 (1988): I. http://dx.doi.org/10.1016/0730-725x(88)90485-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Kärger, Jörg, Dieter Freude, and Jürgen Haase. "Diffusion in Nanoporous Materials: Novel Insights by Combining MAS and PFG NMR." Processes 6, no. 9 (2018): 147. http://dx.doi.org/10.3390/pr6090147.

Full text

Abstract:

Pulsed field gradient (PFG) nuclear magnetic resonance (NMR) allows recording of molecular diffusion paths (notably, the probability distribution of molecular displacements over typically micrometers, covered during an observation time of typically milliseconds) and has thus proven to serve as a most versatile means for the in-depth study of mass transfer in complex materials. This is particularly true with nanoporous host materials, where PFG NMR enabled the first direct measurement of intracrystalline diffusivities of guest molecules. Spatial resolution, i.e., the minimum diffusion path leng

APA, Harvard, Vancouver, ISO, and other styles

4

Grombacher, Denys. "Modelling surface NMR spin-echo experiments in a heterogeneous B1 field." Geophysical Journal International 219, no. 2 (2019): 1395–404. http://dx.doi.org/10.1093/gji/ggz388.

Full text

Abstract:

SUMMARY Surface nuclear magnetic resonance (NMR) measurements show great promise for characterization of subsurface water content, pore-sizes and permeability. The link between surface NMR and pore-size/permeability is founded in the connection between the NMR signal's time dependence and the geometry of the pore-space. To strengthen links between the NMR signal and pore-geometry multipulse surface NMR sequences have been developed to estimate the parameter T2, which carries a strong link to pore-geometry and has formed the basis for NMR-based permeability estimation in the petroleum industry

APA, Harvard, Vancouver, ISO, and other styles

5

Rief, Martin, Reinhard Raggam, Peter Rief, et al. "Comparison of Two Nuclear Magnetic Resonance Spectroscopy Methods for the Measurement of Lipoprotein Particle Concentrations." Biomedicines 10, no. 7 (2022): 1766. http://dx.doi.org/10.3390/biomedicines10071766.

Full text

Abstract:

Background: Measuring lipoprotein particle concentrations may help to improve cardiovascular risk stratification. Both the lipofit (Numares) and lipoprofile (LabCorp) NMR methods are widely used for the quantification of lipoprotein particle concentrations. Objective: The aim of the present work was to perform a method comparison between the lipofit and lipoprofile NMR methods. In addition, there was the objective to compare lipofit and lipoprofile measurements of standard lipids with clinical chemistry-based results. Methods: Total, LDL, and HDL cholesterol and triglycerides were measured wit

APA, Harvard, Vancouver, ISO, and other styles

6

Dillon, Patrick F., and Patrick R. Sears. "Capillary electrophoretic measurement of tissue metabolites." American Journal of Physiology-Cell Physiology 274, no. 3 (1998): C840—C845. http://dx.doi.org/10.1152/ajpcell.1998.274.3.c840.

Full text

Abstract:

A method for the measurement of tissue metabolites from rabbit urinary bladder using capillary electrophoresis (CE) has been developed. The method generates a reproducible electropherogram containing >20 peaks, including NAD, NADH, lactate, UDP-glucose, phosphocreatine, creatine, ATP, ADP, GTP, and UTP, from <20 nl of extract solution generated from 1.1 nl (or ∼1.2 μg) of tissue in <40 min. Multiple samples from the same bladder produce SE comparable with enzymatic or nuclear magnetic resonance (NMR) measurements of metabolites: phosphorus-NMR measurement requires 106 more tissue than

APA, Harvard, Vancouver, ISO, and other styles

7

Granger, P., M. Bourdonneau, O. Assémat, and M. Piotto. "NMR chemical shift measurements revisited: High precision measurements." Concepts in Magnetic Resonance Part A 30A, no. 4 (2007): 184–93. http://dx.doi.org/10.1002/cmr.a.20089.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Legchenko, Anatoly V., and Oleg A. Shushakov. "Inversion of surface NMR data." GEOPHYSICS 63, no. 1 (1998): 75–84. http://dx.doi.org/10.1190/1.1444329.

Full text

Abstract:

The main advantage of the surface nuclear magnetic resonance (NMR) method compared to other geophysical methods in the field of groundwater investigation is the ability to measure an NMR signal directly from the water molecules. An NMR signal stimulated by an alternating current pulse through an antenna at the surface, confirms the existence of water in the subsurface with a high degree of reliability. The NMR signal amplitude depends on the pulse parameter (the product of the pulse amplitude and its duration), bulk water volume, and water depth. Measurements are performed while varying the pu

APA, Harvard, Vancouver, ISO, and other styles

9

Buist, Richard J., Roxanne Deslauriers, John K. Saunders, and Graham W. Mainwood. "23Na and flame photometric studies of the NMR visibility of sodium in rat muscle." Canadian Journal of Physiology and Pharmacology 69, no. 11 (1991): 1663–69. http://dx.doi.org/10.1139/y91-247.

Full text

Abstract:

23Na nuclear magnetic resonance spectroscopy (NMR) is increasingly being used to study Na+ gradients and fluxes in biological tissues. However, the quantitative aspects of 23Na NMR applied to living systems remain controversial. This paper compares sodium concentrations determined by 23Na NMR in intact rat hindlimb (n = 8) and excised rat gastrocnemius muscle (n = 4) with those obtained by flame photometric methods. In both types of samples, 90% of the sodium measured by flame photometry was found to be NMR-visible. This is much higher than previously reported values. The NMR measurements for

APA, Harvard, Vancouver, ISO, and other styles

10

Newling, Benedict. "Gas flow measurements by NMR." Progress in Nuclear Magnetic Resonance Spectroscopy 52, no. 1 (2008): 31–48. http://dx.doi.org/10.1016/j.pnmrs.2007.08.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Deng, Feng, Lizhi Xiao, Mengying Wang, et al. "Online NMR Flowing Fluid Measurements." Applied Magnetic Resonance 47, no. 11 (2016): 1239–53. http://dx.doi.org/10.1007/s00723-016-0832-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Suits, B. H., R. W. Siegel, and Y. X. Liao. "NMR measurements of nanophase silver." Nanostructured Materials 2, no. 6 (1993): 597–602. http://dx.doi.org/10.1016/0965-9773(93)90033-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Berkowitz, Bruce A., James T. Handa, and Charles A. Wilson. "Perfluorocarbon temperature measurements using19F NMR." NMR in Biomedicine 5, no. 2 (1992): 65–68. http://dx.doi.org/10.1002/nbm.1940050204.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Prammer, Manfred G. "Hydrocarbon saturation measurements by NMR." Concepts in Magnetic Resonance 13, no. 6 (2001): 406–8. http://dx.doi.org/10.1002/cmr.1028.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Leisen, Johannes, Haskell W. Beckham, and Michael Benham. "Sorption Isotherm Measurements by NMR." Solid State Nuclear Magnetic Resonance 22, no. 2-3 (2002): 409–22. http://dx.doi.org/10.1006/snmr.2002.0069.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Diserens, G., D. Hertig, M. Vermathen, et al. "Metabolic stability of cells for extended metabolomical measurements using NMR. A comparison between lysed and additionally heat inactivated cells." Analyst 142, no. 3 (2017): 465–71. http://dx.doi.org/10.1039/c6an02195f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Kärger, Jörg, Marija Avramovska, Dieter Freude, Jürgen Haase, Seungtaik Hwang, and Rustem Valiullin. "Pulsed field gradient NMR diffusion measurement in nanoporous materials." Adsorption 27, no. 3 (2021): 453–84. http://dx.doi.org/10.1007/s10450-020-00290-9.

Full text

Abstract:

AbstractLabeling in diffusion measurements by pulsed field gradient (PFG) NMR is based on the observation of the phase of nuclear spins acquired in a constant magnetic field with purposefully superimposed field gradients. This labeling does in no way affect microdynamics and provides information about the probability distribution of molecular displacements as a function of time. An introduction of the measuring principle is followed by a detailed description of the ranges of measurements and their limitation. Particular emphasis is given to an explanation of possible pitfalls in the measuremen

APA, Harvard, Vancouver, ISO, and other styles

18

Praud, Raphaël, Vincent Sarou-Kanian, David Sicsic, Michael Deschamps, and Elodie Salager. "Development of a NMR Device Adapted to Operando Analysis of Electrochemical Commercial Cells." ECS Meeting Abstracts MA2023-02, no. 1 (2023): 97. http://dx.doi.org/10.1149/ma2023-02197mtgabs.

Full text

Abstract:

NMR (Nuclear Magnetic Resonance) spectroscopy is a common analytical technique for analysing electrode materials. Most of these analyses are ex situ NMR measurements, a post mortem analysis of the cell. Yet, development of in situ and operando NMR considerably increased. Since the first in situ measurement reported by Gerald et al [1] in 2000, a large variety of operando NMR approaches have been developed and applied to batteries [2–5].Two levers of improvement remain for operando NMR: the battery-casing design, usually home-made, and the geometry of the NMR resonator used to detect the spectr

APA, Harvard, Vancouver, ISO, and other styles

19

Ozawa, Kiyoshi, Laurent Guiguard, Sharon Pursglove, Gottfried Otting, and Nicholas Dixon. "2R1415 In vitro expression of various proteins for NMR measurements." Seibutsu Butsuri 42, supplement2 (2002): S149. http://dx.doi.org/10.2142/biophys.42.s149_1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Brandner, Juergen J. "In-Situ Measurements in Microscale Gas Flows—Conventional Sensors or Something Else?" Micromachines 10, no. 5 (2019): 292. http://dx.doi.org/10.3390/mi10050292.

Full text

Abstract:

Within the last few decades miniaturization has a driving force in almost all areas of technology, leading to a tremendous intensification of systems and processes. Information technology provides now data density several orders of magnitude higher than a few years ago, and the smartphone technology includes, as well the simple ability to communicate with others, features like internet, video and music streaming, but also implementation of the global positioning system, environment sensors or measurement systems for individual health. So-called wearables are everywhere, from the physio-paramet

APA, Harvard, Vancouver, ISO, and other styles

21

Zhang, Yan, Yiqiao Song, Sihui Luo, Tingting Lin, and Huabing Liu. "Core Analysis Using Nuclear Magnetic Resonance." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 65, no. 2 (2024): 173–93. http://dx.doi.org/10.30632/pjv65n2-2024a3.

Full text

Abstract:

Core analysis is critical for oil and gas exploration and recovery. Nuclear magnetic resonance (NMR) has been widely applied to the petroleum industry for many years, and NMR core analysis plays an important role in supporting borehole NMR formation evaluation and understanding the mechanisms of petrophysics and petrochemistry. It’s unfortunate, however, that there has been a lack of commented descriptions of the basic procedures for NMR rock core analysis in the literature, which has led to issues of comparability and repeatability of NMR measurements between different laboratories. In this p

APA, Harvard, Vancouver, ISO, and other styles

22

Rönnols, Jerk, Ernesto Danieli, Hélène Freichels, and Fredrik Aldaeus. "Lignin analysis with benchtop NMR spectroscopy." Holzforschung 74, no. 2 (2020): 226–31. http://dx.doi.org/10.1515/hf-2018-0282.

Full text

Abstract:

AbstractBenchtop nuclear magnetic resonance (NMR) spectroscopy is an emerging field with an appealing profile for industrial applications. The instrumentation offers the possibility to measure NMR spectra in situations where high-field NMR spectroscopy is considered too expensive or complicated. In this study, we investigated the scope and limitations of 1H NMR measurements on kraft lignins and black liquors at low magnetic field strengths (1.0 and 1.5 T). The ability to quantify different classes of compounds was investigated and found to be promising. NMR-based diffusion measurements were pe

APA, Harvard, Vancouver, ISO, and other styles

23

Felix-Gonzalez, N., A. L. Urbano-Bojorge, C. Sanchez-L. de Pablo, V. Ferro-Llanos, F. del Pozo-Guerrero, and J. J. Serrano-Olmedo. "Power Absorption Measurements during NMR Experiments." Journal of Magnetics 19, no. 2 (2014): 155–60. http://dx.doi.org/10.4283/jmag.2014.19.2.155.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Denney, Dennis. "NMR Measurements To Characterize Gas Reservoirs." Journal of Petroleum Technology 51, no. 11 (1999): 58–59. http://dx.doi.org/10.2118/1199-0058-jpt.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Hashi, Kenjiro, Tadashi Shimizu, Atsushi Goto, Takahiro Iijima, and Shinobu Ohki. "NMR Measurements with a Hybrid Magnet." Japanese Journal of Applied Physics 43, No. 8A (2004): L1020—L1022. http://dx.doi.org/10.1143/jjap.43.l1020.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Allard, Mathieu, and R. Mark Henkelman. "Using metamaterial yokes in NMR measurements." Journal of Magnetic Resonance 182, no. 2 (2006): 200–207. http://dx.doi.org/10.1016/j.jmr.2006.06.029.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Mullins, T. R., V. V. Dmitriev, A. J. Armstrong, J. R. Hook, and H. E. Hall. "Low field NMR measurements in3He-A." Physica B: Condensed Matter 194-196 (February 1994): 769–70. http://dx.doi.org/10.1016/0921-4526(94)90714-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Singer, Annett, and Wolf Hiller. "Pulsed NMR measurements on polyethylene melts." Polymer Bulletin 14, no. 5 (1985): 469–75. http://dx.doi.org/10.1007/bf00263464.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Price, Kristin E., Laura H. Lucas, and Cynthia K. Larive. "Analytical applications of NMR diffusion measurements." Analytical and Bioanalytical Chemistry 378, no. 6 (2004): 1405–7. http://dx.doi.org/10.1007/s00216-003-2410-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Terao, Takehiko. "Structural measurements by solid-state NMR." Journal of Molecular Structure 441, no. 2-3 (1998): 283–94. http://dx.doi.org/10.1016/s0022-2860(97)00301-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Meyer, Ronald A., and Truman R. Brown. "Diffusion measurements by microscopic NMR imaging." Journal of Magnetic Resonance (1969) 76, no. 3 (1988): 393–99. http://dx.doi.org/10.1016/0022-2364(88)90345-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Turner, Robert, and Paul Keller. "Angiography and perfusion measurements by NMR." Progress in Nuclear Magnetic Resonance Spectroscopy 23, no. 1 (1991): 93–133. http://dx.doi.org/10.1016/0079-6565(91)80003-k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Hiller, Thomas, and Norbert Klitzsch. "Joint inversion of nuclear magnetic resonance data from partially saturated rocks using a triangular pore model." GEOPHYSICS 83, no. 4 (2018): JM15—JM28. http://dx.doi.org/10.1190/geo2017-0697.1.

Full text

Abstract:

Measurement of nuclear magnetic resonance (NMR) relaxation is a well-established laboratory/borehole method to characterize the storage and transport properties of rocks due to its direct sensitivity to the corresponding pore-fluid content (water/oil) and pore sizes. Using NMR, the correct estimation of, e.g., permeability strongly depends on the underlying pore model. Usually, one assumes spherical or cylindrical pores for interpreting NMR relaxation data. To obtain surface relaxivity and thus, the pore-size distribution, a calibration procedure by, e.g., mercury intrusion porosimetry or gas

APA, Harvard, Vancouver, ISO, and other styles

34

Bryan, J., A. Kantzas, and C. Bellehumeur. "Oil-Viscosity Predictions From Low-Field NMR Measurements." SPE Reservoir Evaluation & Engineering 8, no. 01 (2005): 44–52. http://dx.doi.org/10.2118/89070-pa.

Full text

Abstract:

Summary Canada contains vast reserves of heavy oil and bitumen. Viscosity determination is key to the successful recovery of this oil, and low-field nuclear magnetic resonance (NMR) shows great potential as a tool for estimating this property. An NMR viscosity correlation previously had been developed that is valid for order-of-magnitude estimates over a wide range of viscosities and temperatures. This correlation was built phenomenologically, using experiments relating NMR spectra to viscosity. The present work details a more thorough investigation into oil viscosity and NMR, thus providing a

APA, Harvard, Vancouver, ISO, and other styles

35

Fukumori, Kenzo, Norio Sato, and Toshio Kurauchi. "Pulsed NMR Study of Motional Heterogeneity in Acrylonitrile-Butadiene/Poly(Vinyl Chloride) Blends." Rubber Chemistry and Technology 64, no. 4 (1991): 522–33. http://dx.doi.org/10.5254/1.3538570.

Full text

Abstract:

Abstract Motional heterogeneity in blends of NBR (AN = 38%) and PVC was studied by 1H pulsed NMR. It was estimated from NMR relaxation measurements that the PVC molecules in the NBR phase form phase domains of the order of less than 10 nm, consistent with the microheterogeneous structure observed by TEM. Furthermore, by spin diffusion experiments using the Goldman-Shen pulse sequence, the size of the PVC phase domains was semiquantitatively evaluated to be 4.2 nm in the case of the cylindrical domains and to be 5.1 nm in the case of the spherical domains. It becomes clear that pulsed NMR compl

APA, Harvard, Vancouver, ISO, and other styles

36

Dick, M. J., D. Veselinovic, and D. Green. "Spatially resolved wettability measurements using nmr wettability index." E3S Web of Conferences 89 (2019): 03001. http://dx.doi.org/10.1051/e3sconf/20198903001.

Full text

Abstract:

Wettability is a crucial petrophysical parameter for determining accurate production rates in oil and gas reservoirs. However, industry standard wettability measurements (Amott Test and USBM) are expensive and time consuming. It is known that NMR response varies as a function of wettability change in rock core plug samples. This information was used to develop an NMR wettability index (NWI) based on T2 distributions. This NWI is capable of measuring changes in wettability as a function of oil/water saturations unlike traditional methods which are based on measurements at Swi and Sor only. In a

APA, Harvard, Vancouver, ISO, and other styles

37

Gronski, Wolfram, Uwe Hoffmann, Gerald Simon, Andre Wutzler, and Ekkehard Straube. "Structure and Density of Crosslinks in Natural-Rubber Vulcanizates. A Combined Analysis by NMR Spectroscopy, Mechanical Measurements, and Rubber-Elastic Theory." Rubber Chemistry and Technology 65, no. 1 (1992): 63–77. http://dx.doi.org/10.5254/1.3538608.

Full text

Abstract:

Abstract 13C-NMR MAS solid-state spectroscopy and 1H-NMR relaxation measurements have been applied for quantitative determination of crosslink density in sulfur-accelerated NR vulcanizates. It is shown that the 13C-NMR method is able to distinguish between monosulfidic crosslinks and polysulfldic structures; therefore a quantitative determination of chemical crosslinks was possible. An analysis of 13-NMR transversal relaxation measurements provided the network densities which were in good agreement with the results of the 13C-NMR measurements. Comparing stress-strain data with the spectroscopi

APA, Harvard, Vancouver, ISO, and other styles

38

Kärger, J., N. K. Bär, W. Heink, H. Pfeifer, and G. Seiffert. "On the Use of Pulsed Field Gradients in a High-Field NMR Spectrometer to Study Restricted Diffusion in Zeolites." Zeitschrift für Naturforschung A 50, no. 2-3 (1995): 186–90. http://dx.doi.org/10.1515/zna-1995-2-310.

Full text

Abstract:

Abstract A probe system is described which allows the application of magnetic field gradient pulses with amplitudes up to 24 T/m for self-diffusion measurements by means of a PFG NMR spectrometer operating at a proton resonance frequency of 400 MHz. It is demonstrated that PFG NMR measurements in the high field of a superconducting magnet necessitate precautions which are of minor relevance for measurements with iron magnets. Taking advantage of the large gradient intensity and the high sensitivity in signal detection of the described system, attenuation patterns of the NMR spin echo are obser

APA, Harvard, Vancouver, ISO, and other styles

39

Medellin, David, Vivek Ramachandran Ravi, and Carlos Torres-Verdín. "Pore-size-dependent fluid substitution method for magnetic resonance measurements." GEOPHYSICS 84, no. 1 (2019): D25—D38. http://dx.doi.org/10.1190/geo2017-0457.1.

Full text

Abstract:

Pore-size distribution and permeability can be accurately estimated from nuclear magnetic resonance (NMR) measurements acquired in single-fluid-saturated rocks. However, most rocks penetrated by wells contain multiple fluids and are commonly affected by mud-filtrate invasion, which makes the analysis and interpretation of longitudinal ([Formula: see text]) and transverse ([Formula: see text]) relaxation measurements challenging. It is necessary to replace the hydrocarbon NMR response of the original measurements with an equivalent water response to estimate petrophysical quantities of interest

APA, Harvard, Vancouver, ISO, and other styles

40

Nuixe, Magali, Amidou Sissou Traoré, Shannan Blystone, et al. "Circadian Variation of Root Water Status in Three Herbaceous Species Assessed by Portable NMR." Plants 10, no. 4 (2021): 782. http://dx.doi.org/10.3390/plants10040782.

Full text

Abstract:

Roots are at the core of plant water dynamics. Nonetheless, root morphology and functioning are not easily assessable without destructive approaches. Nuclear Magnetic Resonance (NMR), and particularly low-field NMR (LF-NMR), is an interesting noninvasive method to study water in plants, as measurements can be performed outdoors and independent of sample size. However, as far as we know, there are no reported studies dealing with the water dynamics in plant roots using LF-NMR. Thus, the aim of this study is to assess the feasibility of using LF-NMR to characterize root water status and water dy

APA, Harvard, Vancouver, ISO, and other styles

41

Liao, Zhongshu, Gong Zhang, and Yingying Ma. "Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement." Applied Sciences 14, no. 22 (2024): 10746. http://dx.doi.org/10.3390/app142210746.

Full text

Abstract:

Laboratory core nuclear magnetic resonance (NMR) relaxation measurements offer geological information, including rock porosity and oil saturation, relevant to logging. When core samples drilled from wells are exposed to air, the fluids within their pores inevitably dissipate. This phenomenon may lead to discrepancies between the results of nuclear magnetic resonance relaxation experiments and the actual situation underground. To deeply explore the impact of fluid dissipation on NMR core analysis experimental results, a series of simulated dissipation experiments were designed under constant te

APA, Harvard, Vancouver, ISO, and other styles

42

Hietala, S., S. L. Maunu, F. Sundholm, S. Jämsä, and P. Viitaniemi. "Structure of Thermally Modified Wood Studied by Liquid State NMR Measurements." Holzforschung 56, no. 5 (2002): 522–28. http://dx.doi.org/10.1515/hf.2002.080.

Full text

Abstract:

Summary Thermal modification is a technique to produce wood with increased dimensional stability and lower equilibrium moisture content. 2H NMR relaxation measurements and pulsed field gradient (PFG-NMR) methods are non-invasive spectroscopic techniques that can be used to measure the response of liquid confined in porous materials and yield information on the size and distribution of the pores. These methods were used to study the structure and changes in structure of thermally modified Scots pine wood. The 2H longitudinal relaxation measurements of wood samples at different moisture contents

APA, Harvard, Vancouver, ISO, and other styles

43

Zhang, Houzhu, and Jinhong Chen. "Robust Lp-Norm Inversion for High-Resolution Fluid Contents from Nuclear Magnetic Resonance Measurements." Applied Sciences 11, no. 23 (2021): 11298. http://dx.doi.org/10.3390/app112311298.

Full text

Abstract:

Fluid content computed from nuclear magnetic resonance (NMR) has proved to be an accurate and reliable tool for petrophysical property estimation. To overcome the limitations of conventional NMR measurements, high spatial resolution NMR (HSR-NMR) has been introduced to achieve the desired resolution for cores of any size. However, inversion of fluid contents from HSR-NMR data suffers from nonreliable measurements at the ends of the detection coil due to the heterogeneities of the magnetic fields caused by the relatively small size of the coil. A robust Lp-norm inversion algorithm, developed fo

APA, Harvard, Vancouver, ISO, and other styles

44

Dick, Michael J., Dragan Veselinovic, and Derrick Green. "Review of Recent Developments in NMR Core Analysis." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 63, no. 3 (2022): 454–84. http://dx.doi.org/10.30632/pjv63n3-2022a11.

Full text

Abstract:

The last 10 years have witnessed numerous new developments and advancements in nuclear magnetic resonance (NMR) rock core analysis both in conventional and unconventional reservoirs. On the hardware side, NMR instruments are now capable of handling hundreds of thousands of radio frequency (RF) pulses, and the pulses can be more closely spaced than ever. This allows measuring samples with very fast relaxation times, which was not possible before. Higher field NMR spectrometers operating at frequencies of ~12 MHz and ~20 MHz (in addition to the standard low-field ~2 MHz instruments) were introdu

APA, Harvard, Vancouver, ISO, and other styles

45

Power, J. E., M. Foroozandeh, R. W. Adams, et al. "Increasing the quantitative bandwidth of NMR measurements." Chemical Communications 52, no. 14 (2016): 2916–19. http://dx.doi.org/10.1039/c5cc10206e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Kolar, Petar, Lovro Blažok, and Dario Bojanjac. "How (and why) to determine NMR spectrometer’s noise figure?" tm - Technisches Messen 87, no. 10 (2020): 614–21. http://dx.doi.org/10.1515/teme-2020-0043.

Full text

Abstract:

AbstractIn the last decade or two, it seems that the trend of technological advance in NMR spectroscopy cannot follow the trend of desire to measure NMR samples with gradually lower response signals. Recently, an accurate noise model, based on the concept of noise figure, of the most sensitive part of the NMR spectroscopy system from the aspect of noise, which is its probe-to-spectrometer receiving chain, was introduced. The main purpose of this model is to optimize the used NMR spectroscopy system and, ultimately, enable measuring NMR samples with even lower response signals than the ones mea

APA, Harvard, Vancouver, ISO, and other styles

47

Nascimento, Paloma Andrade Martins, Paulo Lopes Barsanelli, Ana Paula Rebellato, Juliana Azevedo Lima Pallone, Luiz Alberto Colnago, and Fabíola Manhas Verbi Pereira. "Time-Domain Nuclear Magnetic Resonance (TD-NMR) and Chemometrics for Determination of Fat Content in Commercial Products of Milk Powder." Journal of AOAC INTERNATIONAL 100, no. 2 (2017): 330–34. http://dx.doi.org/10.5740/jaoacint.16-0408.

Full text

Abstract:

Abstract This study shows the use of time-domain (TD)-NMR transverse relaxation (T2) data and chemometrics in the nondestructive determination of fat content for powdered food samples such as commercial dried milk products. Most proposed NMR spectroscopy methods for measuring fat content correlate free induction decay or echo intensities with the sample's mass. The need for the sample's mass limits the analytical frequency of NMR determination, because weighing the samples is an additional step in this procedure. Therefore, the method proposed here is based on a multivariate model of T2 decay,

APA, Harvard, Vancouver, ISO, and other styles

48

Zhou, Yu, Guo Qi Wei, and He Kun Guo. "Estimate Permeability from Nuclear Magnetic Resonance Measurements Using Improved Artificial Neural Network Based on Genetic Algorithm." Applied Mechanics and Materials 110-116 (October 2011): 5072–77. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.5072.

Full text

Abstract:

Knowledge of the permeability distribution is critical to a successful reservoir model. Nuclear Magnetic Resonance (NMR) measurements can be used for permeability prediction because the T2 relaxation time is proportional to pore size. Due to the conventional estimators have difficult and complex problems in simulating the relationship between permeability and NMR measurements, an intelligent technique using artificial neural network and genetic algorithm to estimate permeability from NMR measurements is developed. Neural network is used as a nonlinear regression method to develop transformatio

APA, Harvard, Vancouver, ISO, and other styles

49

Toumelin, Emmanuel, Carlos Torres-Verdin, Boqin Sun, and Keh-Jim Dunn. "Limits of 2D NMR Interpretation Techniques to Quantify Pore Size, Wettability, and Fluid Type: A Numerical Sensitivity Study." SPE Journal 11, no. 03 (2006): 354–63. http://dx.doi.org/10.2118/90539-pa.

Full text

Abstract:

Summary Two-dimensional (2D) NMR techniques have been proposed as efficient methods to infer a variety of petrophysical parameters, including mixed fluid saturation, in-situ oil viscosity, wettability, and pore structure. However, no study has been presented to quantify the petrophysical limitations of such methods. We address this problem by introducing a pore-scale framework to accurately simulate suites of NMR measurements acquired in complex rock/fluid models. The general pore-scale framework considered in this paper is based on NMR random walks for multiphase fluid diffusion and relaxatio

APA, Harvard, Vancouver, ISO, and other styles

50

Macdonald, Peter M., and Ronald Soong. "Diffusion NMR and bicelle morphology." Canadian Journal of Chemistry 89, no. 9 (2011): 1021–35. http://dx.doi.org/10.1139/v11-038.

Full text

Abstract:

This minireview focuses on diffusion NMR studies in bicelles. Following a discourse on diffusion fundamentals, and a comparative overview of fluorescence and NMR-based techniques for measuring diffusion, the pulsed field gradient (PFG) NMR diffusion method is introduced, emphasizing its specific advantages and limitations when applied to diffusion measurements in macroscopically oriented lamellar systems such as magnetically aligned bicelles. The utility of PFG NMR diffusion measurements in bicellar model membrane systems for examining lateral diffusion of membrane-bound molecular species is d

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!