Showing 181 - 200 results of 340 for search '"Nuclear magnetic resonance"', query time: 0.04s Refine Results
  1. 181

    Experimental Study on the Pore Structure of Middle- and Low-Rank Coal and Its Influence on Methane Adsorption by Gaini Jia, Ming Yang, Xuebo Zhang, Lei Liu

    Published 2022-01-01
    “…The liquid nitrogen adsorption method was used to study the pore structure of low- and middle-rank coal samples from two aspects: pore specific surface area and pore shape. Low-field nuclear magnetic resonance (NMR) technology was used to study the difference in methane adsorption of coal samples under the same adsorption conditions. …”
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    Article
  2. 182

    An Experimental Study on Stress Sensitivity of Tight Sandstones with Different Microfractures by Xinli Zhao, Zhengming Yang, Zhiyuan Wang, Wei Lin, Shengchun Xiong, Yutian Luo, Zhongkun Niu, Debin Xia

    Published 2020-01-01
    “…Besides, we use the nuclear magnetic resonance (NMR) spectra of the core before and after saturation to verify whether the core has been successfully fractured. …”
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    Article
  3. 183

    An investigation of the potential of rhodamine B hydrazide as a fluorescent probe for enhancing latent fingerprints by Nadeem Muhammad, Amjad Ali, Hairong Cui, Abdullatif Bin Muhsinah, Muhammad Abdul Qadir, Ghulam Mustafa Kamal, Jalal Uddin, Shoaib Munir

    Published 2025-01-01
    “…The resulting hydrazones were purified and characterized through techniques including melting point determination, UV–Vis spectroscopy (λmax ranging from 245 to 555 nm), infrared (IR) spectroscopy, and proton nuclear magnetic resonance (NMR) spectroscopy. The derivatives exhibited strong fluorescence with enhancements up to 90 % at optimized wavelengths, facilitating their use in latent fingerprint visualization. …”
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  4. 184

    3-Methyl-4-Nitrobenzoate Derivates as Antifungal Drug Candidates: Biological and In Silico Evaluation by Alana R. Ferreira, Yunierkis P. Castillo, Ana C. M. Andrade, Diego F. Nóbrega, João Paulo G. de Oliveira, Tamires C. Lima, Ricardo D. de Castro, Damião P. de Sousa

    Published 2025-01-01
    “…The chemical structure of the obtained products was confirmed using Infrared, 1H and APT-13C nuclear magnetic resonance spectroscopy and high-resolution mass spectrometry. …”
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    Article
  5. 185

    Effect of Flaxseed Gum on the Microstructure and Physicochemical Properties of Starch in Frozen Dough by WANG Hongwei, LI Xiangjie, QIAO Jingyue, SHEN Huishan, ZHANG Yanyan, LIU Xingli, ZHAO Xuewei, ZHANG Hua

    Published 2025-01-01
    “…This study investigated the effects of adding different amounts of flaxseed gum (0%, 0.2%, 0.4%, 0.6% and 0.8%) on the microstructure and physicochemical properties of starch in frozen dough using scanning electron microscopy (SEM), solid-state nuclear magnetic resonance (SSNMR) spectroscopy, X-ray diffraction (XRD), and rapid visco analysis (RVA). …”
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  6. 186

    Theoretical Study of the Structural and Electronic Properties of NIPAM Polymer Dosimetry Gel by Swait S. Mohammed, Israa F. Al-sharuee, Akram Mohammed Ali, Adil Elrayah

    Published 2024-12-01
    “…Methods: An examination of the structure of a dosimetry gel polymer of type N- sopropylacrylamide (NIPAM) was carried out with the assistance of the Gaussian 09 software, the Fourier Transform Infrared Spectrometer (FTIR), the proton and carbon nuclear magnetic resonance (H NMR-C NMR), and the ultraviolet-visible spectroscopy (UV-vis) approach were used. …”
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  7. 187

    Hydration of Early Age Cement Paste with Nano-CaCO3 and SAP by LF-NMR Spectroscopy: Mechanism and Prediction by Haitao Zhao, Gaoyang Sun, Lu Yu, Kaidi Jiang, Xiaodong Chen, Ruiming Jia, Yi Wan, Shihai Li

    Published 2019-01-01
    “…In this paper, by testing the evolution of the physically bound water using the low-field nuclear magnetic resonance (LF-NMR) technology, the hydration process of cement paste with nano-CaCO3 (NC) and superabsorbent polymer (SAP) at early age is investigated. …”
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  8. 188

    Design of Microwave Antenna Array for Imaging of Multiphase Flows in Polypropylene Pipes by Khaldoun Alkhalifeh, Hatem Rmili, Bandar Hakim, Nebras Sobahi, Youssef AL-Turki

    Published 2021-01-01
    “…Various methods have been developed for determining the phase ratio including mechanical, optical, X-ray or gamma ray, ultrasound, nuclear magnetic resonance (NMR), and rarely microwave techniques. …”
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  9. 189

    Influence of Mass Concentration on Microstructure and Pore Structure of Coal-Gangue-Based Green Cemented Filling Body by Jisheng Qiu, Minmin Yang, Kun Cheng, Xiao Guan, Xi Luan, Zhijie Xiao

    Published 2023-01-01
    “…The workability, mechanical properties, and microscopic pore structure (nuclear magnetic resonance and scanning electron microscope) were measured, respectively, to explore the effect of MC on the above mentioned properties. …”
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  10. 190

    Characterization of Nanoscale Pores in Tight Gas Sandstones Using Complex Techniques: A Case Study of a Linxing Tight Gas Sandstone Reservoir by Chaohui Lyu, Liguo Zhong, Zhengfu Ning, Qing Wang, David R. Cole

    Published 2021-01-01
    “…In this study, various experimental techniques such as scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) T2, nitrogen adsorption method, and NMR cryoporometry (NMRC) are combined to interrogate the complex pore systems of the tight gas reservoir in the Linxing formation, Ordos Basin, China. …”
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  11. 191

    Effects of Porosity of Dry and Saturated Sandstone on the Energy Dissipation of Stress Wave by Yexue Li, Jing Wang

    Published 2019-01-01
    “…Changes in porosity before and after the SHPB experiment were analyzed by nuclear magnetic resonance. Results show that the number of wave peaks in the T2 spectrum before and after the impact test of sandstone is unchanged, but the wave peak value corresponding to small pores increases. …”
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  12. 192

    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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  13. 193

    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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  14. 194

    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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  15. 195

    Study of Macro- and Mesodamage of Remolded Loess under Alternating Dry and Wet Conditions in an Acid Rain Environment by Wanjun Ye, Yuntao Wu, Yang Bai

    Published 2021-01-01
    “…Considering the influence of acid rain on the engineering characteristics of loess in this area, we investigated changes in the physical and mechanical characteristics of remolded loess under the combined action of acid rain and dry-wet cycles by means of triaxial tests, nuclear magnetic resonance spectroscopy, and scanning electron microscopy. …”
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  16. 196

    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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  17. 197

    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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  18. 198

    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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  19. 199

    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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  20. 200

    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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