Sample records for tabletok pogloshchayushchikh materialov

  1. JPRS Report, Soviet Union, USSR: Materials Science

    DTIC Science & Technology

    1988-08-24

    Interaction of Metal Melt With Carbon Fiber [T.A. Chernyshova , N.L. Bolotov, et al.; FIZIKA I KHIMIYA OBRABOTKI MATERIALOV, No 2, Mar-Apr 88] 6 Ferrous...manuscript received 27 Apr 87) pp 88-92 [Article by T.A. Chernyshova , N.L. Bolotov, L.I. Kobe- leva, M.P. Arsentyeva and K.P. Gurov, Moscow] [Abstract] An

  2. JPRS Report, Science & Technology, USSR: Materials Science

    DTIC Science & Technology

    1988-03-11

    crystallization of the amorphous phase, and subsequent growth of ß-boron grains. References 5: all Russian. 2415/9835 UDC 621.033.67 Erosion of Materials in...Weightlessness and Effect of Magnetic Field on Liquation Processes in InSb Crystals (V. S. Zemskov, M. R. Raukhman; FIZIKA I KHIMIYA OBRABOTKI MATERIALOV, No...No 7, Jul 87) 13 Production of CdP2^CdAs2 Solid-Solution Single Crystals and Measurement of Their Cathodoluminescence Spectra (V, B, Lazarev, S

  3. USSR and Eastern Europe Scientific Abstracts, Materials Science and Metallurgy, Number 54

    DTIC Science & Technology

    1978-06-28

    DEFEKTOSKOPIYA in Russian No 2, Feb 78 pp 49-52 manuscript received 28 Feb 77 DEVYATCHENKO, L. D., YESIPOV, I. V. , BATURINA, S. K., KIRILLOVA, G . K...received 10 Apr 77 KARPINOS, D. M., MAKSIMOVICH, G . G ., LYUTYY, YE. M., FILIPOVSKIY, A. V., and KADYROV, V. KH., Physico-Mechanical Institute and the...OBRABOTKI MATERIALOV in Russian No 1, Jan/Feb 78 pp 149-151 manuscript received 20 Jun 77 KARPINOS, D. M. and ZIL’BERBERG, V. G ., Kiev [Abstract] The

  4. Selected Papers on Noctilucent Clouds

    NASA Technical Reports Server (NTRS)

    1963-01-01

    The papers presented herein were taken from two Russian publications on the International Geophysical Year. The first four articles (footnoted Certain Articles Regarding Meteorology") are from Nekotoryye Problemy Meteorologii; Sbornik Statey, II Razdel Programmy MGG (Meteorologiya), No. 1, Izdat. Akademii Nauk SSSR (Certain Problems Regarding Meteorology; Collection of Articles, Second Section of the IGY Program (Meteorology), No. 1. Published by the Academy of Sciences Press) Moscow, 1960. The last two articles (footnoted "International Geophysical Year") are from Mezhdunarodnoy Geofizicheskiy God; Sbornik Statey i Materialov, Izdat. Leningradskogo Universiteta (International Geophysical Year; Collection of Articles and Materials. Published by the Leningrad University Press) 1960.

  5. Polydopamine-Coated Manganese Complex/Graphene Nanocomposite for Enhanced Electrocatalytic Activity Towards Oxygen Reduction.

    PubMed

    Parnell, Charlette M; Chhetri, Bijay; Brandt, Andrew; Watanabe, Fumiya; Nima, Zeid A; Mudalige, Thilak K; Biris, Alexandru S; Ghosh, Anindya

    2016-08-16

    Platinum electrodes are commonly used electrocatalysts for oxygen reduction reactions (ORR) in fuel cells. However, this material is not economical due to its high cost and scarcity. We prepared an Mn(III) catalyst supported on graphene and further coated with polydopamine, resulting in superior ORR activity compared to the uncoated PDA structures. During ORR, a peak potential at 0.433 V was recorded, which is a significant shift compared to the uncoated material's -0.303 V (both versus SHE). All the materials reduced oxygen in a wide pH range via a four-electron pathway. Rotating disk electrode and rotating ring disk electrode studies of the polydopamine-coated material revealed ORR occurring via 4.14 and 4.00 electrons, respectively. A rate constant of 6.33 × 10(6) mol(-1)s(-1) was observed for the polydopamine-coated material-over 4.5 times greater than the uncoated nanocomposite and superior to those reported for similar carbon-supported metal catalysts. Simply integrating an inexpensive bioinspired polymer coating onto the Mn-graphene nanocomposite increased ORR performance significantly, with a peak potential shift of over +730 mV. This indicates that the material can reduce oxygen at a higher rate but with lower energy usage, revealing its excellent potential as an ORR electrocatalyst in fuel cells.