Showing 161 - 180 results of 280 for search '"nuclear magnetic resonance"', query time: 0.06s Refine Results
  1. 161

    Pore-Scale Investigation on the Plugging Behavior of Submicron-Sized Microspheres for Heterogeneous Porous Media with Higher Permeability by Yafei Liu, Jingwen Yang, Tianjiang Wu, Yanhong Zhao, Desheng Zhou, Shun Liu

    Published 2020-01-01
    “…For the purpose of examining the plugging performance of submicron-sized microspheres in high-permeability porous media, systematic investigations were implemented incorporating macroscale blocking rate tests using core samples and pore-scale water migration analysis via nuclear magnetic resonance (NMR). Experimental results indicate that microsphere particle size dominates the plugging performance among three studied factors and core permeability has the least influence on the plugging performance. …”
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  2. 162

    Experimental Study of the Pore Structure Deterioration of Sandstones under Freeze-Thaw Cycles and Chemical Erosion by Jielin Li, Rennie B. Kaunda, Longyin Zhu, Keping Zhou, Feng Gao

    Published 2019-01-01
    “…In this study, a series of 30 freeze-thaw cycling tests are conducted on sandstone samples soaked in H2SO4 solution and in pure water, prior to the application of nuclear magnetic resonance (NMR) on the rock specimens. The porosity of the sandstone, the distribution of transverse relaxation time T2, and the NMR images are acquired after each freeze-thaw cycle. …”
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  3. 163

    Supramolecular assembly of covalently modified Anderson-type polyoxometalates and crown ethers towards pseudo-rotaxane structures by Yi-An Yin, Wu-Ji Chen, Chun-Yan Liu, Meng-Meng Zhang, Chang-Gen Lin, Haralampos N. Miras, Yu-Fei Song

    Published 2025-03-01
    “…Seven new POM–crown ether complexes were prepared by varying the countercations and the modification mode of the Anderson clusters, and they were fully characterized by single-crystal X-ray diffraction, electrospray ionization time-of-flight mass spectrometry (ESI–TOF–MS), 1H nuclear magnetic resonance (NMR), etc. Alkali metal cations within the cavities of the crown ethers served as supercations to bind to the POM hybrids, thereby forming supramolecular assemblies with different architectures and compositions. …”
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  4. 164

    Semisynthesis of Derivatives of Oleanolic Acid from Syzygium aromaticum and Their Antinociceptive and Anti-Inflammatory Properties by Sibusiso Rali, Opeoluwa O. Oyedeji, Olukayode O. Aremu, Adebola O. Oyedeji, Benedicta N. Nkeh-Chungag

    Published 2016-01-01
    “…The derived compounds were monitored with thin layer chromatography and confirmed with nuclear magnetic resonance (NMR) spectroscopy, mass spectrometry (MS), Fourier infrared (FT-IR) spectroscopy, and melting point (Mp). …”
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  5. 165

    Brain metabolites in ISIAH and Wistar rats by O. B. Shevelev, A. A. Seryapina, A. L. Markel, M. P. Moshkin

    Published 2015-12-01
    “…Due to the development of nuclear magnetic resonance spectroscopy (NMRS), a decrease in neuron viability in different parts of the brain in humans with hypertension has been shown. …”
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  6. 166

    Insights into the formulation properties, biocompatibility, and permeability of poorly water-soluble methoxyflavones with PEG400 and propylene glycol by Eze Fredrick Nwude, Jansakul Chaweewan, Srichana Teerapol

    Published 2023-09-01
    “…Data from differential scanning calorimetry, Fourier-transform infrared (FTIR), and proton nuclear magnetic resonance (1H NMR) spectroscopic analysis revealed physico-chemical compatibility between the three methoxyflavones and PEG400/propylene glycol. …”
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  7. 167

    NMR probing of copper–amyloid β1–16 interactions and self-assembly by Punnepalli Sunanda, Srinivasarao Raghothama, Uma Maheswari Devi Palempalli, Bankala Krishnarjuna

    Published 2024-12-01
    “…In this study, we investigated copper ion–Aβ1–16 interactions using nuclear magnetic resonance (NMR) spectroscopy, circular dichroism, and transmission electron microscopy. …”
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  8. 168

    Methane Adsorption in Anthracite Coal under Different Pressures and Temperatures—A Study Combining Isothermal Adsorption and Molecular Simulation by Tieya Jing, Jian Zhang, Mingyu Zhu, Wentao Zhao, Juan Zhou, Yulong Yin

    Published 2023-01-01
    “…In this study, the molecular structure and methane adsorption capacity of anthracite coal collected from Diandong Coalfield (China) were studied based on 13C nuclear magnetic resonance (13C NMR), Fourier transform infrared spectroscopy (FT-IR), and methane isothermal adsorption experiment. …”
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  9. 169

    Conductive supramolecular acrylate hydrogels enabled by quaternized chitosan ionic crosslinking for high-fidelity 3D printing by Lukas A. Bauman, Boxin Zhao

    Published 2025-03-01
    “…This yielded high-fidelity 3D-printed conductive supramolecular hydrogels with tensile properties of 288±29 kPa at 516±37 % elongation and compressive properties of 572±34 kPa at 65±4 % strain with uniform swelling (320–350 %). Nuclear magnetic resonance and conductivity measurements confirmed SPA-rich blocks within the hydrogel network and the solvent-dependent copolymer structure. …”
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  10. 170

    Epidemiological, clinical and imaging profile of Multiple Sclerosis by Làzaro Aurelio Vàzquez Gòmez, Carlos Hidalgo Mesa, Benita Mabel Beltrán González, Yunier Broche Pérez, Ana María Mederos Herrera

    Published 2021-12-01
    “…Disability evaluated as minimal was found in 50 patients and 31 patients had 2 to 4 lesions on nuclear magnetic resonance.<br /><strong>Conclusions:</strong> Adequate epidemiological information on patients with multiple sclerosis in Villa Clara was obtained satisfactorily. …”
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  11. 171

    Creep Characteristics of Different Saturated States of Red Sandstone after Freeze-Thaw Cycles by Yongxin Che, Yongjun Song, Jianxi Ren, Jiaxing Chen, Xixi Guo, Hao Tan, Mengling Hu

    Published 2021-01-01
    “…To investigate the creep mechanical characteristics of rocks in different saturated states after freeze-thaw cycles, samples with different saturations (30%, 50%, 70%, 90%, and 100%) were selected for nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and uniaxial compression creep tests. …”
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  12. 172

    Experimental Study on Mechanical Property and Pore Distribution of Limestone Specimens after Heat Treatment under Different Heating Conditions by Yujie Feng, Haijian Su, Qian Yin, Liyuan Yu, Yingchao Wang

    Published 2021-01-01
    “…Then, physical, mechanical, and nuclear magnetic resonance (NMR) tests were carried out to investigate the effect of heating conditions on the rock properties. …”
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  13. 173

    Heavy Oil Residue Upgrading With Iron Based Catalysts Under High Hydrogen Pressure by Muzaffer Yaşar, Solmaz Akmaz, Savaş Gürdal, Kadir Yılmaz

    Published 2021-12-01
    “…Gel Permeation Chromatography (GPC), Nuclear Magnetic Resonance (1H NMR) and elemental analysis were used for Iranian heavy oil residue. …”
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  14. 174

    Integrated analysis of cellulose structure and properties using solid-state low-field H-NMR and photoacoustic spectroscopy by Levente Csóka, Worakan Csoka, Ella Tirronen, Ekaterina Nikolskaya, Yrjö Hiltunen, Bunsho Ohtani

    Published 2025-01-01
    “…Specifically, we employ low-field proton nuclear magnetic resonance (H-NMR) to delve into the diverse hydrogen atom types within the cellulose molecule. …”
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  15. 175

    Synthesis, Characterization, and Aqueous Properties of an Amphiphilic Terpolymer with a Novel Nonionic Surfmer by Qin Yu, Xiaolin Wu, Yanqiu Li, Tenglong Gao, Siliang Liu, Caiqing Hou, Zirong Zheng

    Published 2018-01-01
    “…The aggregative behaviors of PAADs were explored by 13C nuclear magnetic resonance, a viscometer, and a surface tension instrument. …”
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  16. 176

    Influence of Drying–Wetting Cycles on the Water Retention and Microstructure of Residual Soil by Xu-tang Xu, Dao-qi Liu, Zhen-xing Xian, Feng Yang, Wen-bin Jian, Xiang Xu, Jian-bin Huang

    Published 2022-01-01
    “…The pressure plate test and nuclear magnetic resonance (NMR) spectroscopy were used to investigate the influence of drying–wetting cycles on the soil–water characteristic curve (SWCC) and pore-size distribution (POSD) of undisturbed residual soil. …”
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  17. 177

    Mechanism Analysis of the Influence of Freeze-Thaw on the Damage and Debonding Evolution of Sandstone-Concrete Interface by Yanjun Shen, Tao Luo, Xin Wei, Xueting Li, Long Jin, Liangdong Wen, Hui Peng, Yanjun Ji

    Published 2022-01-01
    “…Accordingly, based on the combination of sandstone-concrete as the object, through the development of sandstone-concrete interface freeze-thaw cycling test, and combining the nuclear magnetic resonance (NMR) test and scanning electron microscopy (SEM) analysis, the mechanism of debonding by freeze-thaw damage at the sandstone-concrete interface was systematically revealed. …”
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  18. 178

    Experimental study on the influencing factors and pore production law of CO2 huff-and-puff in tight sandstone reservoirs by Zhe Zhang, Jian Sun, Zhihao Niu, Zhilin Tuo, Xinyu Zhong, Xiaolei Zheng, Rongjun Zhang

    Published 2025-01-01
    “…Combined with nuclear magnetic resonance technology, the influences of injection pressure, cycle numbers and soaking time on the CO2 huff-and-puff effect were evaluated, and the optimal CO2 huff-and-puff parameters were optimized. …”
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  19. 179

    Azurin a potent anticancer and antimicrobial agent isolated from a novel Pseudomonas aeruginosa strain by Nourhan A. Zaghloul, Mona K. Gouda, Yasser Elbahloul, Nancy M. El Halfawy

    Published 2025-01-01
    “…The partially purified azurin protein was characterized using polyacrylamide gel electrophoresis, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and nuclear magnetic resonance spectroscopy. Notably, qualitative elemental analysis by EDX showed the presence of copper and sulfur, corresponding to the copper-core and disulfide-bridge, respectively, in the purified azurin fraction. …”
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  20. 180

    Effect of Pea Resistant Starch on Emulsion Gel Properties and in Vitro Digestibility of Myofibrillar Proteins by CHEN Jinyu, HU Fangyang, JI Zhirui, WU Zijian

    Published 2024-12-01
    “…The chemical force results showed that the addition of pea RS3 led to enhanced hydrophobic interaction and disulfide bonding between MP molecules. Low field-nuclear magnetic resonance (LF-NMR) confirmed that pea RS3 addition facilitated the migration of free water to immobilized water. …”
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