A5101992450- Plant Diversity and Evolution
- Non-Destructive Testing Techniques
- Paleontology and Stratigraphy of Fossils
- Plant and Fungal Species Descriptions
- Ultrasonics and Acoustic Wave Propagation
- Welding Techniques and Residual Stresses
- Fern and Epiphyte Biology
- Plant and animal studies
- Geophysical Methods and Applications
- Iron and Steelmaking Processes
- Geology and Paleoclimatology Research
- Geological and Geophysical Studies
- Metallurgical Processes and Thermodynamics
- Geological and Geochemical Analysis
- Mineral Processing and Grinding
- Fossil Insects in Amber
- Geochemistry and Geologic Mapping
- Aeolian processes and effects
- Magnetic Properties and Applications
- Evolution and Paleontology Studies
- Electrical and Bioimpedance Tomography
- Paleontology and Evolutionary Biology
- Software Engineering and Design Patterns
- Invertebrate Taxonomy and Ecology
- Environmental Changes in China
Tsinghua University
2025
Taiyuan Institute of Technology
2024-2025
Beihang University
2021-2024
Nanjing Institute of Geology and Paleontology
2017-2024
Chinese Academy of Sciences
2017-2024
East China University of Science and Technology
2024
Northeastern University
2019-2021
Peking University
2015-2017
University of Science and Technology of China
2011
Shanghai Jiao Tong University
2005
The colonization of terrestrial environments by rooted vascular plants had far-reaching impacts on the Earth system. However, belowground structures early are rarely documented, and thus plant-soil interactions in ecosystems poorly understood. Here we report earliest paleosols (fossil soils) Asia from Early Devonian deposits Yunnan, China. Plant traces extensive within soil occur as complex network-like structures, which interpreted representing long-lived, rhizomes basal lycopsid...
Metallic plates are widely used in a variety of industrial applications, from which conductivity is key parameter related to the quality metals. In order accurately measure conductivity, this paper proposes novel eddy current method based on sweep-frequency strategy. First all, simplified theoretical model for measurement derived classical Dodd and Deeds analytical solution. Based solution, real imaginary parts mutual inductance signal have an intersection frequency domain. According...
The influence of earthquake disasters on human social life is positively related to the magnitude and intensity earthquake, effectively avoiding casualties property losses can be attributed accurate prediction earthquakes. In this study, an electromagnetic sensor investigated assess earthquakes in advance by collecting signals. At present, mainstream comprises two methods. On one hand, most geophysicists or data analysis experts extract a series basic features from precursor signals for...
Eddy current testing (ECT) is an efficient method to estimate the thickness of sample but it affected by other parameters information including electromagnetic properties and lift-off. In previous researches, lift-off point intersection (LOI) feature has been found in pulsed eddy (PEC), which can overcome fluctuation this paper, another feature, i.e. conductivity intersection(CPI), proposed for non-coaxial T-R sensor PEC. Specifically, response signals different almost intersect with each at...
Metallic samples are widely applied in modern industrial production. Due to non-uniformities the stress load, such may become damaged and produce defects, which can cause unnecessary economic losses. In this paper, an online defect detection method is proposed for quality monitoring of metallic plates. The research involves design optimisation electromagnetic tomography (EMT) sensor development a fast algorithm. Specifically, planar array eddy current designed in-situ structural health...
The ovules or seeds (fertilized ovules) with wings are widespread and especially important for wind dispersal. However, the earliest in Famennian of Late Devonian rarely known about dispersal syndrome usually surrounded by a cupule. From Xinhang, Anhui, China, we now report new taxon ovules, Alasemenia tria gen. et sp. nov. Each ovule this possesses three integumentary evidently extending outwards, folding inwards along abaxial side enclosing most part nucellus. is borne terminally on smooth...
Titanium and stainless steel are widely used in industries due to their advantages of high strength good corrosion resistance. Such materials have common electromagnetic features – with a relatively low conductivity ~105 − 106 S/m relative permeability 1. In terms structure health monitoring, is an important physical parameter metal materials, which closely related its purity, heat treatment state, internal stress hardness temperature. Therefore, accurate efficient estimation such metals...
Eddy current (EC) sensors have been applied to detect defects in many years. Since both and the lift-off variation will lead measurement signal fluctuation, it is necessary distinguish defect response response. In this work, a novel eddy method proposed for detection immune via triple-coil structure. Firstly, simplified theoretical model built investigate relationship between inductance variation. It found proportional logarithm of real part under high frequency. terms sensor design,...
The thickness and conductivity of metal materials are important parameters because they can determine the purity, hardness, heat treatment state metal. In order to better monitor metal, this paper proposes a method simultaneously measure sample based on single-frequency eddy current testing scheme. First all, it is found that phase coil mutual impedance approximately proportional Dodd Deeds analytical solution when relatively low. However, as increases, linear fitting cannot be strictly...
Electromagnetic coupling and liftoff variation are obstacles in the eddy current method. In this article, we proposed a sweep-frequency method to achieve conductivity permeability simultaneous measurements immune liftoff. The relationship between detection signals of different frequencies electromagnetic parameters magnetic materials has been found, that is, real part mutual inductance is mainly related at low frequencies. high frequency, zero crossover frequency proportional ratio...
This paper proposed a method to simultaneously estimate the permeability, conductivity, thickness and lift-off of metallic plates using sweep frequency eddy current measurement combined with machine learning. The whole processing mainly divided into characteristic extractions data driven learning model. According classical Dodd Deeds analytical solution, value mutual inductance signal related parameters are extracted based on theoretical derivation. inherently coupled together, thus cannot...