Article
Engineering, Electrical & Electronic
Alexey V. Spirin, Evgeny Yu. Zaytsev, Sergey N. Paranin
Summary: This work focuses on the manufacturing and study of steel conductors with inhomogeneous surface conductivity. By chromizing the steel, a diffuse layer with monotonically changing resistivity is formed on the surface. A method involving surface grinding, resistance measurement, and data analysis is proposed to investigate the resistivity distribution across the diffuse layer. The resistivity near the surface is almost the same for different steels and shows a linear correlation with chromium concentration in the material.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Review
Chemistry, Multidisciplinary
Akanksha Pragya, Tushar K. Ghosh
Summary: Functionally gradient materials (FGM) with gradual variations in their properties have potential applications in human interaction technologies. This article discusses the design and functional principles of biological and manmade FGMs, and highlights the challenges and potential pathways to leverage soft materials for functional FGMs.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Taro Yamauchi, Manabu Hagiwara, Shinobu Fujihara
Summary: Two types of trivalent lanthanide ions were doped into cubic perovskite-type BaSnO3, with La3+ as the electron donor and luminescent Ln(3+) ions as the second dopant. Sm3+ exhibited strong photoluminescence and the effects on optical and electrical properties were studied by varying La3+ and Sm3+ contents. Changes in PL intensity and electrical resistivity were observed based on the concentrations of La3+ and Sm3+.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Geochemistry & Geophysics
P-A Duvillard, F. Magnin, A. Revil, A. Legay, L. Ravanel, F. Abdulsamad, A. Coperey
Summary: Knowledge of the thermal state of steep alpine rock faces is crucial for assessing geohazards related to permafrost degradation. This study uses a new petrophysical model with electrical conductivity and normalized chargeability data to infer permafrost distribution, finding that only the NW face of the rock ridge is frozen. By modeling bedrock temperature across the ridge and confirming permafrost presence, a low-cost approach to monitoring temperature distribution in Alpine rock walls is provided in response to climate change.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Environmental Sciences
Xiaochun Lu, Xiao Liu, Bobo Xiong, Xue Cui, Bin Tian, Zhenglong Cai, Ning Shuang, Mi Zhou
Summary: In this study, the water content of landslide soil was measured by modeling the relationship between resistivity, volumetric water content, and temperature. The model was validated through tests and it was found that as the reservoir levels rose, the water content of the landslide soil increased. The proposed method of using high-density electrical method in combination with the developed model was proven to be reliable and practicable in hydrodynamic landslide monitoring.
Article
Materials Science, Ceramics
Michel Venet, Washington Santa-Rosa, Harvey Amorin, Pablo Ramos, Miguel Alguero
Summary: Magnetoelectric composites offer room-temperature functional responses for technologies like high-sensitivity magnetic sensors. Cofired ceramic layered structures stand out for their direct bonding between phases, aiding in miniaturization. The electrical characteristics of magnetostrictive materials also play a role in the magnetoelectric effect.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Shuai Wang, Cheng Ji, Peng Dai, Guobiao Guo, Liming Shen, Ningzhong Bao
Summary: Large LTG crystals were grown using the Czochralski method, exhibiting good thermal properties and desirable piezoelectric characteristics. Heat treatment at high temperatures caused an increase in electrical resistivity and the formation of a La-rich and Ga-poor layer on the LTG surface. The increase in high-temperature electrical resistivity can be explained by the increase in oxygen vacancies.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Oceanography
Yanlong Li, Nengyou Wu, Changling Liu, Qiang Chen, Fulong Ning, Shuoshi Wang, Gaowei Hu, Deli Gao
Summary: Laboratory visual detection is an effective and low-cost method for studying hydrate accumulation mechanisms, but the understanding of spatial hydrate distribution and its dynamic evolutionary behaviors is still limited. In this study, a two-dimensional electrical resistivity tomography (ERT) apparatus was used to map hydrate-bearing porous media in the laboratory. The results showed a nonlinear decrease in average electrical conductivity with hydrate formation, heterogeneous evolution of plane conductivity fields, and alternating positions of local preferred hydrate formation throughout the experiments.
ACTA OCEANOLOGICA SINICA
(2022)
Article
Materials Science, Ceramics
Jianwei Sun, Qiang Jing, Liwen Lei, Jinyong Zhang
Summary: The residual stress distribution in different Si3N4/SiC functionally graded materials (FGM) formed during fabrication processes was investigated using X-ray diffraction method. It was found that the residual stress in FGMs with different component gradients was determined by the quadratic function of the component content and mainly influenced by the thermal mismatch and elastic modulus caused by the component content gradient. The maximum tensile strength of FGMs was limited by the ultimate tensile strength or shearing strength of SiC. Cracks formed when the maximum tensile strength exceeded the ultimate tensile strength or shearing strength of SiC, and the maximum residual stress was within the ultimate limit leading to a newly balanced stress distribution due to the same gradient function. These results provide insights for regulating the performance and designing the gradient of FGMs for specific applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Jiasong Chang, Xiaoling Peng, Jing Li, Tristan Ellis
Summary: Ni/ZrO2 metal-ceramic functionally graded materials (FGMs) were successfully prepared using a moving-magnetic-field-driving method, with their microstructures and performance influenced by various factors. Optimization of the composition gradient of FGMs can be achieved by adjusting magnetic field parameters and constituent parameters.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Bin Liu, Wei Cao, Lingbo Zhang, Kaiyong Jiang, Ping Lu
Summary: This paper proposes an improved design method for FGPMs to tailor the graded relative elasticity field with stochastic Voronoi structures driven by FEA results. Experimental and numerical validation show that the proposed method has superior geometric modeling ability and elasticity tailoring accuracy, resulting in FGPMs with better mechanical performance compared to others.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2021)
Article
Mechanics
Dewei He, Dan Huang, Liwei Wu, Yepeng Xu
Summary: In this paper, a modified fully coupled thermo-mechanical ordinary state-based peridynamic (OSBPD) model is proposed to investigate the thermal failure of functionally graded materials (FGMs). An extra exothermic term caused by irreversible damage is introduced to study the influence of intrinsic dissipation on thermal responses in FGMs, and different methods for handling cracks in heat conduction are compared. The proposed model is verified through typical examples and compared with existing numerical and experimental results. The influence of heat released during the irreversible damage process on the temperature field is analyzed, and the thermal failure of FGMs with gradient variation of material parameters is discussed, demonstrating that a reasonable component distribution can effectively improve their thermal failure resistance.
COMPOSITE STRUCTURES
(2023)
Article
Multidisciplinary Sciences
G. Gonzalez-Pedreros, J. A. Camargo-Martinez, F. Mesa
Summary: The Cooper-pair distribution function D-cp (omega, T-c) reveals information about the superconductor state through spectral regions where Cooper pairs are formed and shows proportionality with experimental or theoretical T-c values. The low-energy region plays an important role in electron-phonon superconductivity, with variations in this region leading to changes in T-c.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
S. Sibilia, F. Bertocchi, S. Chiodini, F. Cristiano, L. Ferrigno, G. Giovinco, A. Maffucci
Summary: This paper investigates the temperature dependence of the electrical resistivity of low-cost commercial graphene-based strips, finding a linear trend and negative temperature coefficient in a wide temperature range. The derived analytical model of temperature-dependent resistivity is validated for heating applications using the graphene strips. These materials can potentially be used as thermistors in sensing or heating applications.
Article
Physics, Applied
Jian Liang, Qian Chen, Qingjie Guo, Wei Jiang, Zhaocong Huang, Biao You, Jun Du, Ya Zhai
Summary: This study demonstrates the enhancement of spin dynamic damping in Co40Fe40B20 (CFB) films by capping with neodymium (Nd). The study also reveals that the matched resistivity at both sides of the CFB/Nd interface plays a crucial role in the enhancement. Additionally, the damping enhancement of CFB is not affected by inserting a 1-2 nm Cu layer, but is suppressed when the Cu layer thickness exceeds 3 nm.
APPLIED PHYSICS LETTERS
(2022)
Article
Polymer Science
Zhongming Yuan, Hiroko Yamamoto, Shinji Kanehashi, Takeshi Shimomura
Summary: This study reports the synthesis of a flexible light-emitting polymer film using a solution blending method. The selective positioning of MEH-PPV molecules in the PS phase of the film was confirmed. The film exhibited a nanometer-scale luminescent domain with low aggregation quenching and showed good elastomeric characteristics.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2024)
