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  1. No Access

    Article

    Comparison of Polarization Fading Compensation Methods for Broadband Microwave Photonic Links by Introduced Noise and Achievable Dynamic Range

    Two methods for compensation of polarization fading in microwave photonic links have been studied. Comparison of noise characteristics has been performed and factors limiting the dynamic range of microwave pho...

    V. V. Lebedev, A. N. Petrov, M. V. Parfenov, E. N. Velichko… in Technical Physics (2023)

  2. No Access

    Article

    Mode Transformation in Hybrid Waveguides Based on Lithium Niobate for Efficient Coupling to a Standard Single Mode Fiber

    Topology of a hybrid waveguide device, which performs an effective transformation of a standard gradient titanium in-diffused waveguide mode to a hybrid waveguide mode, is considered. With its help a rather la...

    M. V. Parfenov, P. M. Agruzov, I. V. Ilichev, A. A. Usikova… in Technical Physics (2023)

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    Article

    Synthesis of Micro-Mesoporous ZSM-23 Zeolite

    Two procedures were suggested for preparing a micro-mesoporous zeolite of MTT topology (ZSM-23 type) with the molar ratio SiO2/Al2O3 = 100 in the presence of dimethylformamide as a template. The f...

    L. V. Pirutko, M. V. Parfenov, A. I. Lysikov, E. Yu. Gerasimov in Petroleum Chemistry (2021)

  4. No Access

    Article

    Laser Modification of Titanium Film in Optical Waveguides on Lithium Niobate Substrates

    It is shown that laser modification of a nanometer titanium film can be used for precise control of the loss level in optical waveguides on lithium niobate substrates. Theoretical estimates of the change in li...

    A. V. Tronev, M. V. Parfenov, N. A. Solomonov, A. M. Ionov… in Technical Physics Letters (2020)

  5. No Access

    Article

    Improving the Efficiency of the Integrated Optical Superconducting Single Photon Detector on a Lithium Niobate Substrate by Means of an Additional Cover Layer with a High Refractive Index

    The mechanism of enhancing the interaction of optical radiation with a superconducting niobium nitride film on the surface of optical waveguides on a lithium niobate substrate using an additional cover layer w...

    M. V. Parfenov, A. V. Shamrai in Technical Physics Letters (2020)

  6. No Access

    Article

    Effect of the ZSM-23 Synthesis Method on the Properties of Pt/ZSM-23/Al2O3 Catalysts in n-Decane Conversion

    Zeolites of the MTT framework type (Si/Al = 30) have been synthesized using dimethylformamide as a template and by a template-free method (Si/Al = 24). The morphology, textural, and acidic properties of the sy...

    M. Yu. Smirnova, L. V. Piryutko, Yu. S. Brester, M. V. Parfenov… in Petroleum Chemistry (2020)

  7. No Access

    Article

    Redistribution of Optical Power in the Arms of a Waveguide Y-splitter under Local External Illumination of the Lithium Niobate Substrate

    The optical tuning of the power splitting ratio in an integrated optical Y-splitter fabricated on the substrate of a photorefractive lithium niobate crystal (LiNbO3) has been studied. The areas of the Y-splitter ...

    M. V. Parfenov, A. V. Tronev, I. V. Ilichev, P. M. Agruzov… in Technical Physics Letters (2020)

  8. No Access

    Article

    Influence of Type of Organic Template on the Properties of Zeolites ZSM-23

    The influence of the type of organic template from the series: pyrrolidine, dimethylformamide, N-methylpyrrolidone on the physicochemical properties of zeolite of MTT structure (ZSM-23) was studied. The optimal c...

    L. V. Piryutko, M. V. Parfenov, A. I. Lysikov… in Russian Journal of Applied Chemistry (2019)

  9. No Access

    Article

    Preparing High-Octane Motor Fuel Components via the Oxidation of an Industrial Isobutane Fraction

    The deep processing of heavy oil increases the production of hydrocarbon gases. The resulting butanes do not always find an equivalent market. A mixture of oxygenates with a high octane number is obtained in t...

    D. P. Ivanov, A. S. Kharitonov, L. V. Pirutko, M. V. Parfenov… in Catalysis in Industry (2019)

  10. No Access

    Article

    Photorefractive Correction of the Coupling Ratio of an Integrated Optical Directional X-Coupler on a Lithium Niobate Substrate

    The possibility of correcting the power coupling ratio of an integrated optical directional X-coupler upon excitation of a local photorefractive response in the substrate material (LiNbO3) has been analyzed. The ...

    M. V. Parfenov, A. V. Tronev, I. V. Il’ichev, P. M. Agruzov… in Technical Physics Letters (2019)

  11. No Access

    Article

    New methods for the preparation of high-octane components from catalytic cracking olefins

    A new method has been suggested for the preparation of high-octane components from the butane–butylene fraction (BBF) in two stages. At the first stage, the BBF olefins are oxidized with N2O into carbonyl compoun...

    A. S. Kharitonov, D. P. Ivanov, M. V. Parfenov, L. V. Piryutko… in Catalysis in Industry (2017)