90The terahertz magneto-spectroscopy under high magnetic fields is a quit powerful tool to investigate the electron properties such as the effective mass and mobility [1, 2]. In general, the measurements at lower temperature are more advantageous to observe, for instance, the cyclotron resonance. It is, however, almost impossible to achieve the terahertz measurements at helium-3 temperatures, because the spectrum of blackbody radiation at the room temperature spread over the terahertz energy region. We are developing the terahertz magneto-spectroscopy combined with the helium-3 refrigerator, using light pipe system which leads the prove light to the sample. The light pipe system has the advantage of reducing blackbody radiation from the room temperature. As the results, we succeeded to cool the sample down to less than 0.8 K. At the poster presentation, we will discuss the detailed optical system and further improvements. The term percolation, most often, when used to describe materials refers to the process where a liquid or gas spreads through a network of interconnected pathways within porous or nonmetallic materials. Metal structures generally lack such networks, however, the geometry of objects can be shaped in such a way as to obtain it. Studies indicate that an appropriate use of the phenomenon in the design of mathematically defined spatial geometries allows the creation of components of low mass and high strength. The term “phase percolation” refers to the process of percolation occurring between different phases or components within a composite material at the microscale level, where two or more distinct phases are combined to achieve specific properties. Phase percolation occurs when a continuous network forms between the phases, enabling the transfer of physical or chemical properties throughout the material. Material properties are typically assessed based on the concentrations of specific phases or elements, but the identical chemical composition doesn’t ensure the same microscale structure. This leads to variability in properties due to the differences in spatial arrangement of phases. By determining the percolation threshold engineers can design composites with enhanced properties. Studies indicate that in the heat treatment processes the arrangement of phases can be modified to induce percolation, resulting in achieving desired mechanical properties. Poster Award NomineeP5-19Development of the Terahertz Magneto-spectroscopic System with Helium-3 Refrigerator Kanji Takehana and Yasutaka Imanaka Center for Basic Research on Materials, National Institute for Materials Science (NIMS) [1] K. Takehana et al., Appl. Phys. Lett., 96, 193110 (2010). [2] K. Takehana et al., Current Applied Physics, 14, S119 (2014). P5-20Physical Modelling of Spatial Geometries at the Micro- and Macroscale Based on the Percolation Phenomenon Robert SaraczynFaculty of Mechanical and Industrial Engineering, Warsaw University of Technology
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