Browsing by Author "Kuusela, Petri"

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    Clauser-Horne-Shimony-Holt Bell inequality test in an optomechanical device
    (2018) Manninen, Juuso; Asjad, Muhammad; Ojajärvi, Risto; Kuusela, Petri; Massel, Francesco; Department of Applied Physics; Centre of Excellence in Quantum Technology, QTF; Quantum Circuits and Correlations; University of Jyväskylä
    We propose here a scheme based on the measurement of quadrature phase coherence that is aimed at testing the Clauser-Horne-Shimony-Holt Bell inequality in an optomechanical setting. Our setup is constituted by two optical cavities dispersively coupled to a common mechanical resonator. We show that it is possible to generate Einstein-Podolsky-Rosen-like correlations between the quadratures of the output fields of the two cavities and, depending on the system parameters, to observe the violation of the Clauser-Horne-Shimony-Holt inequality.
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    Monitoring of concrete segregation using AC impedance spectroscopy
    (Elsevier Science Ltd., 2023-06-27) Ojala, Teemu; Ahmed, Hassan; Kuusela, Petri; Seppänen, Aku; Punkki, Jouni; Department of Civil Engineering; Mineral Based Materials and Mechanics; Department of Civil Engineering; University of Eastern Finland
    Segregation is one of the major phenomena decreasing the durability of concrete and increasing its risk of failure. This paper investigates the feasibility of AC Impedance Spectroscopy (ACIS) to serve as a monitoring technique for the concrete segregation during compaction. The impedances of fresh concrete were determined between compaction intervals. Changes in the calculated bulk resistivities were compared to hardened densities of the drilled cores, as well as to aggregate segregation obtained via digital image analysis of the hardened concrete sections. During the compaction process, a significant difference in the bulk resistivity was observed between the top and bottom parts of segregated specimens in comparison to unsegregated specimens. By inspecting the relationship between the measurement methods, it was found that ACIS provides a reliable approach (r=-0.948) for estimating the segregation level in cases where the resistivity is mostly affected by the movement of aggregates.