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  1. AU="Drobyshev, Sergey"
  2. AU="Timme, Kathleen H"
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  1. Article ; Online: Analysis of Aluminum Oxides Submicron Particle Agglomeration in Polymethyl Methacrylate Composites.

    Kuklin, Vladimir / Karandashov, Sergey / Bobina, Elena / Drobyshev, Sergey / Smirnova, Anna / Morozov, Oleg / Danilaev, Maxim

    International journal of molecular sciences

    2023  Volume 24, Issue 3

    Abstract: Agglomeration of distributed particles is the main problem in polymer composites reinforced with such particles. It leads to a decrease in mechanical performance and its poor reproducibility. Thus, development of methods to address the agglomeration of ... ...

    Abstract Agglomeration of distributed particles is the main problem in polymer composites reinforced with such particles. It leads to a decrease in mechanical performance and its poor reproducibility. Thus, development of methods to address the agglomeration of particles is relevant. Evaluation of the size and concentration of agglomerates is required to select a method to address agglomeration. The paper analyzes aluminum oxide particles agglomeration in particles-reinforced polymethyl methacrylate (PMMA) composites. Quantitative parameters of polystyrene-coated aluminum oxide particles agglomerates are obtained for the first time in this article. Unlike uncoated aluminum oxide particles, when coated aluminum oxide particles are used, agglomerates concentration in polymer composites decreases approx. 10 times. It demonstrates that modification of submicron particles by a polymer coating decreases the number of agglomerates in the polymer composite. The use of transmittance and opacity values to estimate particles agglomerates is reasonable in this article. It is shown that the difference in optical performance of specimens reinforced with coated and the original particles is related to the number and average size of agglomerates in the specimens. For example, when the concentration exceeds 0.2%, transmittance values for the specimens reinforced with coated particles are greater than the ones for the specimens reinforced with the original particles.
    MeSH term(s) Polymethyl Methacrylate ; Aluminum ; Aluminum Oxide ; Reproducibility of Results ; Polymers
    Chemical Substances Polymethyl Methacrylate (9011-14-7) ; Aluminum (CPD4NFA903) ; Aluminum Oxide (LMI26O6933) ; Polymers
    Language English
    Publishing date 2023-01-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms24032515
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Comparison of the particle flux measured by Liulin-MO dosimeter in ExoMars TGO science orbit with those calculated by models.

    Semkova, Jordanka / Benghin, Victor / Guo, Jingnan / Zhang, Jian / Da Pieve, Fabiana / Krastev, Krasimir / Matviichuk, Yuri / Tomov, Borislav / Shurshakov, Vyacheslav / Drobyshev, Sergey / Mitrofanov, Igor / Golovin, Dmitry / Litvak, Maxim

    Life sciences in space research

    2022  Volume 39, Page(s) 119–130

    Abstract: The knowledge of the space radiation environment in spacecraft transition and in Mars vicinity is of importance for the preparation of the human exploration of Mars. ExoMars Trace Gas Orbiter (TGO) was launched on March 14, 2016 and was inserted into ... ...

    Abstract The knowledge of the space radiation environment in spacecraft transition and in Mars vicinity is of importance for the preparation of the human exploration of Mars. ExoMars Trace Gas Orbiter (TGO) was launched on March 14, 2016 and was inserted into circular Mars science orbit (MSO) with a 400 km altitude in March 2018. The Liulin-MO dosimeter is a module of the Fine Resolution Epithermal Neutron Detector (FREND) aboard ExoMars TGO and has been measuring the radiation environment during the TGO interplanetary travel to Mars and continues to do so in the TGO MSO. One of the scientific objectives of the Liulin-MO investigations is to provide data for verification and benchmarking of the Mars radiation environment models. In this work we present results of comparisons of the flux measured by the Liulin-MO in TGO Mars orbit with calculated estimations. Described is the methodology for estimation the particle flux in Liulin-MO detectors in MSO, which includes modeling the albedo spectra and procedure for calculation the fluxes, recorded by Liulin-MO on the basis of the detectors shielding model. The galactic cosmic rays (GCR) and Mars albedo radiation contribution to the detectors count rate was taken into account. The GCR particle flux was calculated using the Badhwar O'Neil 2014 model for December 1, 2018. Detailed calculations of the albedo spectra of protons, helium ions, neutrons and gamma rays at 70 km height, performed with Atmospheric Radiation Interaction Simulator (AtRIS), were used for deriving the albedo radiation fluxes at the TGO altitude. In particular, the sensitivity of the Liulin-MO semiconductor detectors to neutron and gamma radiation has been considered in order to calculate the contribution of the neutral particles to the detected flux. The results from the calculations suggest that the contribution of albedo radiation can be about 5% of the measured total flux from GCR and albedo at the TGO altitude. The critical effect of TGO orientation, causing different shading of the GCR flux by Mars, is also analysed in detail. The comparison between the measurements and estimations shows that the measured fluxes exceed the calculated values by at least 20% and that the effect of TGO orientation change is approximately the same for the calculated and measured fluxes. Accounting for the ACR contribution, secondary radiation and the gradient of GCR spectrum from 1 AU to 1.5 AU, the calculated flux may increase to match the measurement results. The results can serve for the benchmarking of GCRs models at Martian orbit.
    MeSH term(s) Humans ; Radiation Dosimeters ; Extraterrestrial Environment ; Orbit ; Radiation Monitoring/methods ; Mars
    Language English
    Publishing date 2022-08-24
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2214-5532
    ISSN (online) 2214-5532
    DOI 10.1016/j.lssr.2022.08.007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Phenyliminophenothiazine based self-organization of polyaniline nanowires and application as redox probe in electrochemical sensors.

    Khadieva, Alena I / Gorbachuk, Vladimir V / Evtugyn, Gennady A / Belyakova, Svetlana V / Latypov, Ruslan R / Drobyshev, Sergey V / Stoikov, Ivan I

    Scientific reports

    2019  Volume 9, Issue 1, Page(s) 417

    Abstract: Synthesis and application of nanostructured materials applicable in the assembly of electrochemical sensors is one of the important trends in material sciences and analytical chemistry. In this work, we have proposed and implemented simple non-template ... ...

    Abstract Synthesis and application of nanostructured materials applicable in the assembly of electrochemical sensors is one of the important trends in material sciences and analytical chemistry. In this work, we have proposed and implemented simple non-template method for assembling nanofibers from the polyaniline ultrasonicated with phenyliminophenothiazine in aqueous media. Two-step procedure including association with emeraldine dispersion and reorganization under ultrasonication led to formation of nanofibrillar structures with average diameter of 20 nm. UV-spectroscopy confirms that association of phenyliminophenothiazine and polyaniline in acidic medium resulted in an intense absorption band at 900-910 nm due to donor-acceptor interaction between the reactants. The material combined emeraldine charge transmission with redox activity of phenyliminophenothiazine was found promising for electrochemical sensing. It was confirmed by comparison of characteristics of appropriate solid-contact sensors based on emeraldine and phenyliminophenothiazine toward Fe(III) ions, ascorbic acid and hydroquinone. In all the cases, the use of phenyliminophenothiazine results in a wider concentration range and more reproducible signal against characteristics of similar sensor based on polyaniline. The applicability of the sensor was confirmed by determination of iron content in commercial medication.
    Language English
    Publishing date 2019-01-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-36937-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Observation of the radiation environment and solar energetic particle events in Mars orbit in May 2018- June 2022.

    Semkova, Jordanka / Koleva, Rositza / Benghin, Victor / Krastev, Krasimir / Matviichuk, Yuri / Tomov, Borislav / Maltchev, Stephan / Dachev, Tsvetan / Bankov, Nikolay / Mitrofanov, Igor / Malakhov, Alexey / Golovin, Dmitry / Litvak, Maxim / Sanin, Anton / Kozyrev, Alexander / Mokrousov, Maxim / Nikiforov, Sergey / Lisov, Denis / Anikin, Artem /
    Shurshakov, Vyacheslav / Drobyshev, Sergey / Gopalswamy, Nat

    Life sciences in space research

    2023  Volume 39, Page(s) 106–118

    Abstract: The dosimeter Liulin-MO for measuring the radiation environment onboard the ExoMars Trace Gas Orbiter (TGO) is a module of the Fine Resolution Epithermal Neutron Detector (FREND). Here we present results from measurements of the charged particle fluxes, ... ...

    Abstract The dosimeter Liulin-MO for measuring the radiation environment onboard the ExoMars Trace Gas Orbiter (TGO) is a module of the Fine Resolution Epithermal Neutron Detector (FREND). Here we present results from measurements of the charged particle fluxes, dose rates and estimation of dose equivalent rates at ExoMars TGO Mars science orbit, provided by Liulin-MO from May 2018 to June 2022. The period of measurements covers the declining and minimum phases of the solar activity in 24th solar cycle and the rising phase of the 25th cycle. Compared are the radiation values of the galactic cosmic rays (GCR) obtained during the different phases of the solar activity. The highest values of the dose rate and flux from GCR are registered from March to August 2020. At the minimum of 24th and transition to 25th solar cycle the dose rate from GCR is 15.9 ± 1.6 µGy h
    MeSH term(s) Solar Activity ; Space Flight ; Orbit ; Radiation Monitoring/methods ; Cosmic Radiation
    Language English
    Publishing date 2023-03-31
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2214-5532
    ISSN (online) 2214-5532
    DOI 10.1016/j.lssr.2023.03.006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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