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Mechanical properties of charcoal and its representativeness of vegetation in northern China.
PLoS One
April 2022
School of Earth Science and Resources, Chang'an University, Xi'an, China.
The objective of this paper is to examine the representativeness of charcoal taxa at archeological sites in northern China. We carried out standardized laboratory compression tests on 168 samples representing 21 taxa charred at four different temperatures to characterize the mechanical properties of common taxa in temperate China. The results indicate that significant fragmentation differences occur between taxa.
View Article and Find Full Text PDFA novel photoacoustic imaging system based on a semi-ring transducer array is proposed to image peripheral blood vessels. The system's penetration depth is deep (∼15 mm) with high spatial (∼200 μm) and temporal resolution. In a clinical study, volumetric photoacoustic data of limbs were obtained within the 50s (for a FOV of 15 cm × 4 cm) with the volunteers in the standing and sitting posture.
View Article and Find Full Text PDFIn this paper, a metal-insulator-metal (MIM) waveguide structure consisting of a side-coupled rectangular cavity (SCRC), a rightward opening semi-ring cavity (ROSRC), and a bus waveguide is reported. The finite element method is used to analyze the transmission characteristics and magnetic-field distributions of the structure in detail. The structure can support triple Fano resonances, and the Fano resonances can be tuned independently by altering the geometric parameters of the structure.
View Article and Find Full Text PDFDeformation of an airfoil-shaped brain surrogate under shock wave loading.
J Mech Behav Biomed Mater
August 2021
Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA. Electronic address:
Improvised explosive devices (IEDs), during military operations, has increased the incidence of blast-induced traumatic brain injuries (bTBI). The shock wave is created following detonation of the IED. This shock wave propagates through the atmosphere and may cause bTBI.
View Article and Find Full Text PDFA phylogenetic and functional perspective on the origin and evolutionary shifts of growth ring anatomical markers in seed plants.
Biol Rev Camb Philos Soc
June 2021
Programa de Pós-Graduação em Botânica, Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Universitária, s/n, Feira de Santana, BA, 44.031-460, Brazil.
We reconstruct the evolutionary changes in different anatomical markers in order to understand the evolution and functional aspects of growth rings during the diversification of seed plants (spermatophytes), one of the largest and most diverse lineages of the tree of life. We carried out a wide revision of the anatomy of secondary xylem in spermatophytes and reconstructed the evolution of the different anatomical markers in a time-calibrated phylogeny. By embodying a functionally and evolutionarily significant concept in growth rings we reveal a new panorama for their frequency and show how common they are in diverse lineages of tropical plants.
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