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Your search keyword '"Cui, Yingzhi"' showing total 28 results
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28 results on '"Cui, Yingzhi"'

2. RNA sequestration in P-bodies sustains myeloid leukaemia

Author

Kodali, Srikanth, Proietti, Ludovica, Valcarcel, Gemma, López-Rubio, Anna V., Pessina, Patrizia, Eder, Thomas, Shi, Junchao, Jen, Annie, Lupión-Garcia, Núria, Starner, Anne C., Bartels, Mason D., Cui, Yingzhi, Sands, Caroline M., Planas-Riverola, Ainoa, Martínez, Alba, Velasco-Hernandez, Talia, Tomás-Daza, Laureano, Alber, Bernhard, Manhart, Gabriele, Mayer, Isabella Maria, Kollmann, Karoline, Fatica, Alessandro, Menendez, Pablo, Shishkova, Evgenia, Rau, Rachel E., Javierre, Biola M., Coon, Joshua, Chen, Qi, Van Nostrand, Eric L., Sardina, Jose L., Grebien, Florian, and Di Stefano, Bruno

Published
2024
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8. Numerical study of NMR relaxation responses in synthetic clayey sandstone by dual-scale modeling

Author

Cui Yingzhi, Shikhov Igor, and Arns Christoph

Subjects
Environmental sciences, GE1-350
Abstract

Nuclear Magnetic Resonance (NMR) relaxometry is a common technique for petrophysical characterization of sedimentary rocks. The standard interpretation of NMR relaxation response assumes that the fast diffusion limit is valid for the whole pore space, allowing to translate transverse relaxation components into pore apertures. However, porous media naturally exhibit multiple length scales. The diffusion between different sized pores may modify the transverse relaxation rate, weakening the relationship with corresponding pore size populations. Focusing on sandstones, we investigate the impact of diffusion coupling on transverse relaxation depending on kaolinite amount, spatial distribution and temperature. A series of synthetic clayey sandstone models with different clay amounts and morphological distributions (pore-lining, pore-filling and laminated) are generated based on a micro-CT image of an actual Bentheimer sandstone. A dual-scale random walk NMR relaxation simulation with resolved multi-porosity kaolinite models is utilized to avoid problems in near to interface exchange regions typical for effective medium representations. Simulations provide spatially resolved dynamics of magnetization exchange between different porosity populations. The results indicate that increased temperature and kaolinite clay amount with lower micro-porosity allows higher magnetization exchange between micro- and macro- porous regions. Pore-lining clay demonstrates stronger diffusional coupling effects, leading to an overestimation of micro-porosity. We further discuss the impact of diffusion coupling on NMR-estimated permeability via SDR and Coates models.

Published
2023
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9. P439: RNA SEQUESTRATION IN P-BODIES PROMOTES LEUKEMIA ONSET AND PROGRESSION

Author

Proietti, Ludovica, primary, Kodali, Srikanth, additional, Valcarcel, Gemma, additional, Vanessa Lopez-Rubio, Anna, additional, Pessina, Patrizia, additional, Eder, Thomas, additional, Cui, Yingzhi, additional, Levin, Florencia, additional, Alber, Bernhard, additional, Manhart, Gabriele, additional, Fatica, Alessandro, additional, Louis Sardina, Jose, additional, DI Stefano, Bruno, additional, and Grebien, Florian, additional

Published
2023
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14. NMR Transverse Relaxation In Clayey Sandstones: A Digital Core Analysis Approach

Author

Cui, Yingzhi

Subjects
Physics::Geophysics
Abstract

Nuclear magnetic resonance (NMR) relaxometry is a common technique for the petrophysical characterization of sedimentary rocks. The standard interpretation of NMR transverse relaxation responses is based on the assumptions of the fast di usion limit allowing direct correlation between NMR response and pore size distribution. However, complex mineralogy and morphology of rocks, especially due to clay minerals, may lead to the co-existence of multiple relaxation regimes in the presence of internal magnetic gradient and di usional coupling e ects. In this thesis, a dual-scale NMR relaxation response simulation approach is proposed to investigate the impact of kaolinite clay on transverse relaxation. The approach utilizes X-ray micro-CT images to capture inter-granular porosity and scanning electron microscopy images to reconstruct clay regions via a resolved clay micro- structure model. The relationship between morphology of rocks, strength of applied magnetic field, resulting relaxation regimes and observed NMR relaxation responses is firstly studied. Paramagnetic clays give rise to relaxation in the localization regime leading to clay-specific relaxation rate enhancement with a strong field-dependency. Second, a dual-scale random walk NMR relaxation simulation with resolved multi-porosity kaolinite is introduced for the study of di usional coupling. It avoids problems associated with e ective medium representations in regions near phase boundaries. The required high-resolution internal magnetic fields are calculated by separation of near- and far-field e ects in a dipole-approximation combined with tri-linear interpolation to reduce errors in the transition regions between coarse- and fine-scale structure. Measured and simulated NMR T2 relaxation responses, including relaxation time distribution shape, are in excellent agreement. The approach is extended to a series of synthetic clayey sandstone models with di erent clay amounts and morphological distributions (pore-lining and pore-filling) to analyse di usional coupling e ects between macro- and micro-pores. A relationship between magnetization exchange, observation time and penetration depth is noted, together with the increase in the di usion coe cient due to temperature. Accounting for these e ects from clay consequently improves NMR-estimated permeability via SDR and Coates models and enables more robust petrophysical interpretations.

Published
2022
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