Publications by authors named "Andrey Alexandrov"

We propose a new wide-field imaging method that exploits the Localized Surface Plasmon Resonance phenomenon to produce super-resolution images with an optical microscope equipped with a custom design polarization analyzer module. In this paper we describe the method and apply it to the analysis of low-energy carbon ion tracks implanted in a nuclear emulsion film. The result is then compared with the measurements of the same tracks carried out at an electronic microscope.

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We report in this paper the muography of an archaeological site located in the highly populated "Sanità" district in the center of Naples, ten meters below the current street level. Several detectors capable of detecting muons - high energy charged particles produced by cosmic rays in the upper layers of atmosphere - were installed underground at the depth of 18 m, to measure the muon flux over several weeks. By measuring the differential flux with our detectors in a wide angular range, we have produced a radiographic image of the upper layers.

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We have designed a fully automated optical microscope running at high-speed and achieving a very high spatial resolution. In order to overcome the resolution limit of optical microscopes, it exploits the localized surface plasmon resonance phenomenon. The customized setup using a polarization analyzer, based on liquid crystals, produces no vibrations and it is capable of probing isolated nanoparticles.

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Article Synopsis
  • Muography is a technique that uses cosmic-ray muons to map the internal structure of volcanoes by observing how these particles are absorbed as they pass through volcanic material.
  • The first experiment using nuclear emulsion muography was conducted at Stromboli volcano, capturing muon data over five months with a detector area of 0.96 m².
  • Results revealed a low-density zone at the volcano's summit, which could influence its eruptive behavior and the stability of the "Sciara del Fuoco" slope, suggesting that periodic muon imaging can effectively monitor volcanic structural changes.
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We propose a novel technique for fully automated optical scanning of thin samples. We analyze its performance and estimate the achievable scanning speed to compare it with conventional techniques. It paves the way to the next generation of highspeed scalable scanning systems, at least one order of magnitude faster than existing ones.

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In the present paper we report the development of the Continuous Motion scanning technique and its implementation for a new generation of scanning systems. The same hardware setup has demonstrated a significant boost in the scanning speed, reaching 190 cm/h. The implementation of the Continuous Motion technique in the LASSO framework, as well as a number of new corrections introduced are described in details.

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Bax is a pro-apoptotic member of the Bcl-2 family of proteins, which is present in the cytosol of various types of cells in full-length form (p21 Bax). During apoptosis, the N-terminal truncated version of Bax (p18 Bax) is often formed via cleavage of the p21 Bax by the calcium-dependent enzyme, calpain. p18 Bax is a membrane protein found primarily in the mitochondrial fraction of apoptotic cells.

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