Showing 81 - 100 results of 280 for search '"Nuclear magnetic resonance"', query time: 0.06s Refine Results
  1. 81

    Characterization and Uncertainty Assessment of a Certified Reference Material of Chloramphenicol in Methanol (GBW(E)082557) by Mengrui Yang, Min Wang, Jian Zhou, Yinqing Song, Tongtong Wang

    Published 2016-01-01
    “…Prior to preparation of CRM candidate of chloramphenicol in methanol with a concentration of 100 mg/L, two independent methods including mass balance (MB) and quantitative nuclear magnetic resonance (qNMR) were employed to precisely measure the mass fraction of pure chloramphenicol materials. …”
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  2. 82

    Elucidation of delignification promotion mechanism by soda cooking with addition of anthraquinone derivative using phenolic β-O-4-type lignin model oligomer by Ke Luo, Taiki Nishimoto, Yasuyuki Matsushita

    Published 2025-01-01
    “…Heteronuclear single quantum coherence nuclear magnetic resonance (HSQC NMR) analysis of the reaction products after cooking revealed that an enol ether signal appeared in the spectrum of the product without 2-EAQ, whereas it was not detected in the product with 2-EAQ. …”
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  3. 83

    Longitudinal Reservoir Evaluation Technique for Tight Oil Reservoirs by Yutian Luo, Zhengming Yang, Zhenxing Tang, Sibin Zhou, Jinwei Wu, Qianhua Xiao

    Published 2019-01-01
    “…In this study, according to the characteristics of longitudinal physical properties of tight oil reservoirs, advanced experimental techniques such as nuclear magnetic resonance, high pressure mercury intrusion, and X-ray diffraction were adopted; the flow capacity, reservoir capacity, ability to build an effective displacement system, and the ability to resist damage in reservoir reconstruction were considered as evaluation indexes; average throat radius, percentage of movable fluid, start-up pressure gradient, and the content of clay minerals were taken as the evaluation parameters. …”
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  4. 84

    Research on Microscopic Pore Structure Characteristics and Producibility of the Chang 9 Reservoir in the Wucangpu Block by Bin Shi, Fangping Chen, Hailong Dang, Zili Jia, Binchi Hou, Lihua Shi, Shengsong Kang, Tao Wang

    Published 2023-01-01
    “…In this paper, the microscopic pore structure characteristics and producibility of the reservoir in the study area are analyzed in detail by means of constant-rate mercury intrusion and nuclear magnetic resonance. The research results show that the reservoir with permeability less than 0.076 mD is mainly composed of microthroat, the reservoir with permeability of 0.208-0.633 mD has a larger proportion of microthin throat, and the reservoir with permeability of 2.722-3.998 mD has a larger proportion of fine-middle throats. …”
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  5. 85

    Study on the Low Temperature Cracking Mechanism of Steel Slag Asphalt Mixture by Macroscale and Microscale Tests by Lan Wang, Xuefeng Bai

    Published 2022-01-01
    “…The microscopic pore characteristics of SAM were studied by nuclear magnetic resonance (NMR). Based on fracture mechanics and weight function theory, the variation law of the stress intensity factor at the crack tip of the asphalt mixture with crack propagation is derived. …”
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    Article
  6. 86

    Identification of Initial Crack and Fracture Development Monitoring under Uniaxial Compression of Coal with High Bump Proneness by Zuoqing Bi, Han Liang, Qianjia Hui

    Published 2021-01-01
    “…The internal crack of the sample is detected by nuclear magnetic resonance (NMR) technology to determine the crack ratio of each sample. …”
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    Article
  7. 87

    Advances in Research on the Interaction of Food-derived Polysaccharide and Polyphenol by Jun HE, Mengdie WANG, Xiaoqiang CHEN, Miaomiao YING

    Published 2025-02-01
    “…This paper describes the means of characterizing food-derived polysaccharide and polyphenol interactions, including Fourier transform infrared (FT-IR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy, and interaction mechanisms such as enzyme-catalyzed reactions and free radical-induced reactions was also summarized. …”
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    Article
  8. 88

    Experimental study on influence of Na-bentonite on viscosity of cement-bentonite slurry by Zheng Wei, Wei Cui, Ri-cheng Miao

    Published 2025-07-01
    “…Based on these results, microscopic tests, including X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and field emission scanning electron microscopy (FESEM), were conducted to explain the reasons for the different properties of different bentonite slurries and their CB slurries. …”
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    Article
  9. 89

    Enhanced quantum hypothesis testing via the interplay between coherent evolution and noises by Qing Li, Lingna Wang, Min Jiang, Ze Wu, Haidong Yuan, Xinhua Peng

    Published 2025-01-01
    “…We then design and experimentally implement a noise-assisted quantum hypothesis testing protocol on ultralow-field nuclear magnetic resonance systems, which demonstrates that the success probability under certain noisy dynamics can indeed surpass the ceiling set by unitary evolution. …”
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  10. 90

    Brittle Characteristic and Microstructure of Sandstone under Freezing-Thawing Weathering by Songtao Yu, Junren Deng, Hongwei Deng, Feng Gao, Jielin Li

    Published 2020-01-01
    “…Mechanical and Nuclear Magnetic Resonance parameters of sandstone under various Freezing-Thawing (F-T) cycles are also acquired and analyzed. …”
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  11. 91

    Application of Artificial Neural Network in the Baking Process of Salmon by Pengfei Jiang, Kaiyue Zhu, Shan Shang, Wengang Jin, Wanying Yu, Shuang Li, Shen Wang, Xiuping Dong

    Published 2022-01-01
    “…This paper deals with the relationship between moisture content, low-field nuclear magnetic resonance (LF-NMR), scanning electron microscope (SEM), and sensory evaluation in the baking process of salmon. …”
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  12. 92

    Insights into the Allosteric Regulation of Human Hsp90 Revealed by NMR Spectroscopy by Tjaša Goričan, Simona Golič Grdadolnik

    Published 2024-12-01
    “…Since no experimentally determined structure of a small-molecule allosteric modulator bound to the CTD of human Hsp90 has yet been obtained, the challenge for a structure-based design of allosteric modulators remains. Solution nuclear magnetic resonance (NMR) spectroscopy could be utilized to overcome these problems. …”
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  13. 93

    NMR Pore Structure and Dynamic Characteristics of Sandstone Caused by Ambient Freeze-Thaw Action by Bo Ke, Keping Zhou, Hongwei Deng, Feng Bin

    Published 2017-01-01
    “…For a deeper understanding of the freeze-thaw weathering effects on the microstructure evolution and deterioration of dynamic mechanical properties of rock, the present paper conducted the nuclear magnetic resonance (NMR) tests and impact loading experiments on sandstone under different freeze-thaw cycles. …”
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  14. 94

    Impact of Petrophysical Properties on Hydraulic Fracturing and Development in Tight Volcanic Gas Reservoirs by Yinghao Shen, Mianmo Meng, Tao Liu, Hongkui Ge, Yuelei Zhang

    Published 2017-01-01
    “…Experiments were performed to study the petrophysical properties of a volcanic reservoir and the spontaneous imbibition is monitored by nuclear magnetic resonance (NMR) and pulse-decay permeability. …”
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  15. 95

    Microscopic Response of Limestone Physical Deterioration under Water-Rock Alternation in the Acidic Environment by Wei Liang, Ke Li, Jiashun Luo, Mengtang Xu, Fushou Feng

    Published 2022-01-01
    “…The increase rate of mass deterioration degree decreases with the increase of cycle number, the maximum average value can reach 61.887% at the beginning of cycles and is relatively stable at 20~25 cycles, and the average value at the end of cycle is obviously reduced by 3.167%. The nuclear magnetic resonance (NMR) test shows that the number and size of pores in the rock gradually increase with the increase of the number of wetting-drying cycles, and the wetting-drying cycles aggravate the internal damage of the rock. …”
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    Article
  16. 96

    New Boric Acid Derivative with Some of Its Complexes and Study the Biological and Anticancer Activity by Alaa Abdullah Majeed, Asmaa Mohammed Noori

    Published 2025-01-01
    “…Spectral methods such as Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, and proton nuclear magnetic resonance (1H-NMR) spectra, along with thermal analysis (TG/DTA), elemental analysis (CHN), and melting point, were used to characterize the synthesized compounds. …”
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  17. 97

    Quantitative Characterization Model of Macroscopic Mechanical Properties of Recycled Concrete Based on Porosity and Pore Sizes by Haiyu Chen, Fuwei Xu

    Published 2024-01-01
    “…By utilizing nuclear magnetic resonance technology to scan the porosity and pore structure of the recycled concrete, an analysis was performed on the correlation between the macroscopic mechanical properties of the recycled concrete and pore sizes (most available pore size, mean pore size, and critical pore size). …”
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  18. 98

    A Novel Paramagnetic Substrate for Detecting Myeloperoxidase Activity in Vivo by Mohammed S. Shazeeb, Yang Xie, Suresh Gupta, Alexei A. Bogdanov

    Published 2012-09-01
    “…Characterization of the resulting probe (bis-HTrp-DTPA(Gd)) in vitro using nuclear magnetic resonance spectroscopy and enzyme kinetic analysis showed that bis-HTrp-DTPA(Gd) (1) improves solubility in water; (2) acts as a substrate for both horseradish peroxidase and MPO enzymes; (3) induces cross-linking of proteins in the presence of MPO; (4) produces oxidation products, which bind to plasma proteins; and (5) unlike bis-5HT-DTPA(Gd), does not follow first-order reaction kinetics. …”
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  19. 99

    Influence of Polyphosphoric Acid on the Consistency and Composition of Formulated Bitumen: Standard Characterization and NMR Insights by Catarina Varanda, Inês Portugal, Jorge Ribeiro, Artur M. S. Silva, Carlos M. Silva

    Published 2016-01-01
    “…Afterwards, the five components and the unmodified and PPA-modified bitumen were characterized by standard methods (penetration, softening point, and penetration index), SARA analysis, elemental analysis, and 31P and 1H nuclear magnetic resonance (NMR) spectroscopy. The results evidenced higher asphaltenes and lower saturates/resins contents in PPA-modified bitumen. …”
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  20. 100

    Genesis Analysis of High-Gamma Ray Sandstone Reservoir and Its Log Evaluation Techniques: A Case Study from the Junggar Basin, Northwest China by Liang Wang, Zhiqiang Mao, Zhongchun Sun, Xingping Luo, Yong Song, Zhen Liu

    Published 2013-01-01
    “…Affected by formation’s high water sensitivity and poor borehole quality, the conventional logs can not recognize reservoir and evaluate the physical property of reservoirs. Then, the nuclear magnetic resonance (NMR) logs is proposed and proved to be useful in reservoir recognition and physical property evaluation.…”
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    Article