Article
Engineering, Marine
Jinhuan Zhao, Changling Liu, Chengfeng Li, Yongchao Zhang, Qingtao Bu, Nengyou Wu, Yang Liu, Qiang Chen
Summary: Characterizing the electrical property of hydrate-bearing sediments is crucial for reservoir identification and saturation evaluation. This study investigates the effect of hydrates on pore water and the relationship between pore water characteristics and the saturation exponent of Archie's law. By using X-ray computed tomography and resistivity measurement technology, the three-dimensional structure and resistivity of hydrate-bearing sediments can be derived simultaneously, allowing for a better understanding of pore water and the saturation exponent at a micro-scale. The results show that the resistivity of hydrate-bearing sediments is influenced by changes in pore water distribution and connectivity caused by hydrate formation. Furthermore, the saturation exponent of Archie's law is controlled by the distribution and connectivity of pore water. A new logarithmic relationship between the saturation exponent and the tortuosity of pore water is proposed, which can be helpful in calculating field hydrate saturation using resistivity logging data.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Civil
Yongwei Fu, Robert Horton, Tusheng Ren, J. L. Heitman
Summary: In this study, a general form of Archie's model was developed to describe the relationship between soil electrical conductivity and volumetric water content. The new model performed well by providing estimates with root mean square errors in the range of 0.008-0.399 dS m(-1) and relative errors ranging from 0.7% to 29.8%, showing its potential for further evaluation on a wide range of soil conditions.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Vladimir A. Lekhov, Sergey P. Pozdniakov, Kamil Nesetril
Summary: Diffusion coefficients for Na+ were measured in low-permeability samples from the deep disposal site of SCC using end-diffusion technique. The results showed a nonlinear decrease in tortuosity with decreasing porosity, and the measured diffusion coefficients were consistent with pore-scale diffusion simulation of microtomography data.
JOURNAL OF CONTAMINANT HYDROLOGY
(2021)
Article
Geosciences, Multidisciplinary
Youzheng Qi, Yuxin Wu
Summary: The conduction mechanism of clayey rocks and soils is influenced by variations in the electrical double layer and the intrinsic clay-and-water conduction pattern, resulting in a non-linear feature. By applying effective medium theory, an easy-to-use non-linear model has been developed that reflects electrochemical theories and explains measurement data well.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Chen Guo, Zhenzhen Fan, Bowen Ling, Zhifang Yang
Summary: In oil and gas exploration, accurate estimation of formation water (or hydrocarbon) content is crucial for reservoir evaluation, development, and production. This letter presents a tensorial Archie's law based on the effective resistivity tensor of the formation, which captures the anisotropy of the formation by including all tensor elements of the resistivity, thus improving the predictability.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Anand Pal, K. Shyam Prasad, K. Gurukrishna, Suraj Mangavati, P. Poornesh, Ashok Rao, Yin-Chun Chung, Y. K. Kuo
Summary: We investigated the synthesis protocols and properties of pure and Pb-doped Cu3Sb1-xPbxSe4 (0 <= x <= 0.04) polycrystalline samples in order to achieve a high figure of merit (ZT). The samples exhibited a tetragonal structure and their electrical resistivity increased with increasing Pb content. The conduction mechanism was found to be dominated by holes, and the samples showed a narrow bandgap behavior. The estimated ZT values showed significant enhancement for the doped samples.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Nanoscience & Nanotechnology
Vikash Sharma, Gunadhor Singh Okram, Yung-Kang Kuo
Summary: We investigated the electrical and thermal transport properties of nickel nanoparticles with varying crystallite sizes. The nanoparticles exhibited a systematic metal to insulator transition, changing the conduction type and showing a colossal Seebeck coefficient and ultralow thermal conductivity. The analysis of electrical resistivity revealed a significant change in the electronic excitation spectrum, indicating the opening of an energy gap and the presence of cotunneling and Coulomb blockade of charge carriers. The Lorenz number also increased with decreasing crystallite size, demonstrating a violation of the Wiedemann-Franz law.
Article
Materials Science, Multidisciplinary
Emile Pangburn, Anurag Banerjee, Hermann Freire, Catherine Pepin
Summary: We revisit a phenomenological model that describes the strange metal phase in cuprates, where fermions are coupled to fluctuating bosons arising from finite-momentum particle-particle pairs. In the non-Fermi-liquid phase, incoherent bosons dominate the transport properties, such as resistivity and optical conductivity. Through the Kubo formalism, we find that the resistivity exhibits approximately linear behavior with temperature and the optical conductivity follows a Drude form, with the Drude lifetime inversely proportional to temperature. We use the memory-matrix approach to compute the transport properties of these bosons, which successfully captures the hydrodynamic regime and provides a suitable framework for describing the transport coefficients in the strange metal phase.
Article
Radiology, Nuclear Medicine & Medical Imaging
June Suh, Jun-Hyeong Kim, Soo-Yeon Kim, Nariya Cho, Dong-Hyun Kim, Rihyeon Kim, Eun Sil Kim, Myoung-jin Jang, Su Min Ha, Su Hyun Lee, Jung Min Chang, Woo Kyung Moon
Summary: The study found that noncontrast-enhanced MRI conductivity imaging had lower cancer detection rates compared to other imaging modalities, but quantitative conductivity measurement showed potential for differentiating between lesions.
JOURNAL OF MAGNETIC RESONANCE IMAGING
(2021)
Article
Chemistry, Physical
U. Deepika Shanubhogue, Anand Pal, Ashok Rao, Saikat Chattopadhyay, Anuradha M. Ashok, Nithya Davis
Summary: In this study, the structural, optical, and high temperature thermoelectric properties of Gd-doped lanthanum cobaltite La1-xGdxCoO3 (x = 0.0, 0.2, 0.4, 0.6) were investigated. The samples were prepared by solid-state reaction technique. XRD studies revealed the structural phase transition and confirmed the formation of the La1-xGdxCoO3 compound. The electrical resistivity showed semiconductor behavior and increased with increased Gd content. Thermopower measurements indicated the presence of both electrons and holes as charge carriers, and the thermopower was enhanced at high temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Computer Science, Interdisciplinary Applications
Maryam Samavaki, Yusuf Oluwatoki Yusuf, Arash Zarrin Nia, Santtu Soderholm, Joonas Lahtinen, Fernando Galaz Prieto, Sampsa Pursiainen
Summary: This study presents a dynamic modeling approach for reconstructing the electrical conductivity atlas of the brain and simulating the effects of cerebral arterial circulation. By coupling the pressure-Poisson equation with Fick's law of diffusion, and using boundary conditions based on the Hagen-Poisseuille model, the researchers were able to estimate the blood pressure in cerebral arteries segmented from MRI data.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Construction & Building Technology
Yunlu Hou, Jerome Lux, Pierre-Yves Mahieux, Philippe Turcry, Abdelkarim Ait-Mokhtar
Summary: This paper investigates the evolution of microstructure and CO2 diffusion coefficient of compacted recycled aggregates during carbonation using X-ray to-mography. The results show that diffusivity coefficients can be estimated by using only the larger pore network (pore size > 5.5 mu m), suggesting that nondestructive imaging approaches are a relevant alternative to experimental characterization methods.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Huiyong Liang, Dawei Guan, Kangji Shi, Lei Yang, Lunxiang Zhang, Jiafei Zhao, Yongchen Song
Summary: The study investigated the mass-transfer characteristics of water and guest molecules in dense hydrate structures during formation from water droplets. Experimental results showed time-dependent 3D morphologies and parameters of hydrate shells, revealing a transition in the water transport schema within hydrate shells from diffusion to permeation. The effective diffusion coefficients of gas and water molecules in hydrates were quantified, providing fundamental insights for optimizing hydrate-based techniques.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Zeliang Su, Etienne Decenciere, Tuan-Tu Nguyen, Kaoutar El-Amiry, Vincent De Andrade, Alejandro A. Franco, Arnaud Demortiere
Summary: The segmentation of tomographic images of battery electrode is crucial for material characterization and electrochemical simulation. We propose a deep learning approach using a CNN for real-world battery material datasets, achieving high accuracy with limited labeled data. We also address the uncertainty in the segmentation quality by identifying human bias in the training data.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Construction & Building Technology
Everton K. Melara, Priscila O. Trentin, Eduardo Pereira, Ronaldo A. Medeiros-Junior
Summary: The objective of this study was to explore the modeling of external sulfate attack (ESA) using electrical resistivity data. An extensive experimental program was designed to relate the sulfate diffusion coefficients to the electrical resistivity of concrete. The results indicated a negligible prediction error when the electrical resistivity was included in the existing service-life models for predicting the entry of sulfates into concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Physics, Atomic, Molecular & Chemical
Yoshito Nakashima
APPLIED MAGNETIC RESONANCE
(2015)
Article
Geochemistry & Geophysics
Yoshito Nakashima, Junko Komatsubara
Article
Mineralogy
Susumu Ikeda, Tsukasa Nakano, Akira Tsuchiyama, Kentaro Uesugi, Yoshito Nakashima, Koichi Nakamura, Hideto Yoshida, Yoshio Suzuki
MINERALOGICAL MAGAZINE
(2017)
Correction
Geochemistry & Geophysics
Yoshito Nakashima
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2018)
Article
Mathematics, Interdisciplinary Applications
Yoshito Nakashima, Junko Komatsubara
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2018)
Article
Instruments & Instrumentation
Tsukasa Nakano, Yoshito Nakashima
JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY
(2018)
Article
Water Resources
Yoshito Nakashima
JOURNAL OF HYDROLOGY AND HYDROMECHANICS
(2013)
Article
Food Science & Technology
Yoshito Nakashima
JOURNAL OF AQUATIC FOOD PRODUCT TECHNOLOGY
(2019)
Article
Energy & Fuels
Yoshito Nakashima, Tetsuya Sawatsubashi, Shuji Fujii
Summary: The moisture content in coal powder is a critical index that affects the handling and combustion efficiency of coal. A unilateral NMR scanner was used to nondestructively quantify the moisture content in powdered samples of brown and subbituminous coals. The results showed reasonable agreement with a conventional bilateral NMR apparatus, indicating its potential application in the quality control of wet coal.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Food Science & Technology
Yoshito Nakashima
JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION
(2020)
Article
Environmental Sciences
Yoshito Nakashima
Summary: The triple-exposure X-ray computed tomography technique proposed in this study improves the accuracy of identifying heavy elements in soil samples. By utilizing different acceleration voltages and conducting quantitative analysis, the method can successfully distinguish lead from other heavy minerals and estimate lead content in clayey soil samples. This nondestructive technique shows promise for characterizing soil samples contaminated with hazardous heavy elements like lead.
SOIL & SEDIMENT CONTAMINATION
(2021)
Article
Food Science & Technology
Yoshito Nakashima, Nobuya Shiba
Summary: By utilizing proton relaxometry, a portable MR scanner with a hand-held sensor unit was developed for nondestructive quantification of intramuscular fat in fresh beef meat. The sensor unit had a detection depth of 7 mm, enabling it to probe meat beneath subcutaneous fat layers less than a few millimeters thick. The scanner showed promising results for fat quantification with minimal error compared to conventional destructive methods.
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
(2021)
Article
Chemistry, Multidisciplinary
Yoshito Nakashima, Tsukasa Nakano
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY
(2020)
Article
Mineralogy
Susumu Ikeda, Yoshito Nakashima, Tsukasa Nakano
JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES
(2019)
Article
Instruments & Instrumentation
Yoshito Nakashima, Tsukasa Nakano
JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY
(2014)