Article
Engineering, Geological
Teng-Fei Fu, Tao Xu, Philip G. Meredith, Thomas M. Mitchell, Michael J. Heap, Yoshitaka Nara
Summary: In this paper, the weakening effects of water on rock through mechanical and chemical processes were investigated using a three-dimensional grain-based model. The experiments and simulations showed that increasing saturation levels led to a decrease in peak strength and elastic modulus of sandstone. Additionally, the long-term brittle deformation and creep behavior of partially saturated sandstone were studied under different saturation levels and stress conditions.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Construction & Building Technology
Jiuwen Bao, Rui Zheng, Jianan Wei, Peng Zhang, Shanbin Xue, Zhaolin Liu
Summary: In this study, an experimental investigation and numerical modeling were conducted to understand the transport mechanism of water and chloride in unsaturated concrete under cyclic drying-wetting condition. The proposed model accurately predicts the coupled transport of water and chloride, and the effects of drying-wetting ratio and initial saturation degree on the transport behavior were discussed.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Geological
Gaoliang Tao, Qing Ouyang, Da Lei, Qingsheng Chen, Sanjay Nimbalkar, Liang Bai, Zhizheng Zhu
Summary: Accurate determination of the effective stress factor is crucial for classifying and defining the contribution of pore water to unsaturated soil strength. This study conducted laboratory experiments to determine the relationship between adsorbed water content and matrix suction, and developed corresponding adsorbed water retention curve and capillary water retention curve. The effective stress factor was replaced with the correlation between matrix suction and the degree of saturation of capillary pores to determine the shear strength of the soil. The NMR-based method showed higher accuracy in predicting shear strength compared to other methods available in the literature, and its accuracy was not affected by changes in dry density or confining pressure.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Engineering, Multidisciplinary
Longxiao Guo, Guangqi Chen, Jingyao Gao, Changze Li
Summary: This study extends the use of DDA to analyze shear characteristics of unsaturated soil by considering capillary and adsorption suction separately. The developed matric suction model is validated and the peak effect of shear strength is successfully reproduced and explained quantitatively using the proposed micro parameter CSN.Furthermore, in the high suction range of cohesive soil, adsorption suction is identified as the dominant factor for apparent cohesion.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Engineering, Geological
Jiuhui Cheng, Xuanzhe Xia, Zhiqiang Liu, Linlin Wang
Summary: The freezing and thawing processes in sandstones under unsaturated conditions are investigated using the low-field nuclear magnetic resonance (NMR) technique. A special pulse sequence is proposed to monitor the water content and distribution during these processes, resulting in minimized temperature perturbations. The results show distinct water distributions between freezing and thawing processes, and the phase transition duration varies with the initial water saturation. The intrinsic kinetic rate coefficient for ice thawing in sandstones is lower than that in bulk condition, suggesting a constrained effect.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Materials Science, Textiles
Na Xu, Guodong Wang, Yanan Tao
Summary: The study focuses on the design and development of functional superfine fiber substrates. By hydrolyzing superfine polyamide fibers under acidic conditions and reacting with methacrylic anhydride, carbon-carbon double bonds are successfully introduced to the surface of the fibers.
TEXTILE RESEARCH JOURNAL
(2023)
Article
Chemistry, Physical
Xiong Li, Haotian Feng, Yuhang Xing, Qing Chang, Jianguo Zhang
Summary: The mineral-solution interface plays a significant role in various soil and geochemical processes as well as industrial applications. This study utilizied molecular dynamics method to investigate the interactions between ions and mineral surfaces under unsaturated conditions, revealing that ions preferentially interact with clay minerals rather than water molecules. The mobility of ions decreases with increasing capillary suction, and the adsorption strength of ions increases with capillary suction. These findings suggest that our current understanding of mineral-solution interactions needs to be revised and improved.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Review
Plant Sciences
Ritesh Kumar, Mohsen Hosseinzadehtaher, Nathan Hein, Mohammad Shadmand, S. V. Krishna Jagadish, Behzad Ghanbarian
Summary: Sap flow measurement is a effective method for quantifying plant water use, which is particularly important under water scarcity and climate change. There are multiple methods for measuring sap flow, but heat-based methods are prone to errors. Non-invasive and portable NMR tools show potential for sap flow measurement, although there are challenges associated with their applications. Developing a non-invasive, portable and inexpensive NMR tool would greatly enhance our ability to monitor vegetation responses to environmental change.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Mathematics, Interdisciplinary Applications
Mariam Sultana, Uroosa Arshad, Muhammad Khalid, Ali Akgul, Wedad Albalawi, Heba Y. Zahran
Summary: This research presents a new iterative predictor-corrector algorithm for solving fractional nuclear magnetic resonance flow equations. The algorithm shows higher accuracy and requires less computational time compared to previous numerical methods. It has a great potential for application in other chaotic systems of fractional differential equations.
FRACTAL AND FRACTIONAL
(2022)
Article
Computer Science, Interdisciplinary Applications
Chuantan Hou, Zilong Zhang, Xiaoli Yang
Summary: This study investigates the face stability of tunnels excavated in unsaturated soils with changing groundwater levels. An analytical framework is developed and validated, showing that the effect of unsaturated flow needs to be considered when the unsaturated zone is sufficiently large. This research provides an important reference for the design of face supports in the initial stage of tunnel excavation in unsaturated soils.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Qian Zhai, Weimin Ye, Harianto Rahardjo, Alfrendo Satyanaga, Yanjun Du, Guoliang Dai, Xueliang Zhao
Summary: This paper presents a new method for estimating the hydraulic conductivity of unsaturated soil by considering the film flow. The proposed method is validated using experimental data from literature. The results suggest that both capillary water flow and film flow should be considered in the estimation of the hydraulic conductivity of unsaturated soil.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Review
Chemistry, Multidisciplinary
Florence Franconi, Laurent Lemaire, Jean-Christophe Gimel, Samuel Bonnet, Patrick Saulnier
Summary: NMR-based diffusion methods are valuable tools for nanomedicine characterization and understanding interactions with the biological environment. They provide insights into diffusion phenomena and measurement of self-diffusion and mutual diffusion coefficients. NMR diffusometry spectroscopic and imaging methods have broad applications in nanomedicine, aiding in elucidating important issues.
JOURNAL OF CONTROLLED RELEASE
(2021)
Article
Construction & Building Technology
Xuande Chen, Thomas Sanchez, David Conciatori, Hicham Chaouki, Luca Sorelli, Brahim Selma, Mohamed Chekired
Summary: In this study, the importance of capillary suction was demonstrated in predicting water transport in ordinary concrete using a hygrothermal transport model. Different transport coefficient expressions were used to describe water transport, and the model was validated through experimental methods and durability tests.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Analytical
Xue Zhang, Qin Wei, Xin Meng, Lili Zhao, Zhaosheng Liu, Yanping Huang
Summary: A new strategy utilizing a dendrimer-like structure of boron materials based on octavinyl-polyhedral oligomeric silsesquioxanes (Ov-POSS) was suggested to improve boronate avidity with good accessibility of sites. The resulting Ov-POSS cross-linked boron monolith showed significantly stronger affinity for glycoproteins compared to the Ov-POSS-free monolith. The developed microfluidic platform, which integrated multiple functions, demonstrated high efficiency and high-throughput analysis for post-translational modification proteomics.
ANALYTICAL CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Ainitze Biteri-Uribarren, Pol Alsina-Bolivar, Carlos Munuera-Javaloy, Ricardo Puebla, Jorge Casanova
Summary: This study tackles the detection of individual molecules by combining a hybrid sensor-a nitrogen vacancy center (NV) and a dangling bond on the diamond surface-with a multi-tone dynamical decoupling sequence. Via numerical simulations, the authors prove that the sequence minimizes the impact of decoherence, which allows using the dangling-bond as a signal amplifier.
COMMUNICATIONS PHYSICS
(2023)