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Sample records for pyroxylin

  1. 焦木素对苯酚吸附性能的研究%STUDY ABOUT ADSORPTION PROPERTIES OF PYROXYLIN FOR PHENOL

    Institute of Scientific and Technical Information of China (English)

    李丽敏; 彭学伟; 焦为成

    2001-01-01

    With pyroxy as an adsorbent,the adsorption of pyroxylin for phenol in sewage,the rate of adsorption,the capacity of adsorption and the effect of pH on the adsorption of phenol were studied.The resullts indicated that the pyroxylin had well properties of adsorption,the adsorption isotherms were conformed to Freundlich equation.

  2. On the history of the development of solid-propellant rockets in the Soviet Union

    Science.gov (United States)

    Pobedonostsev, Y. A.

    1977-01-01

    Pre-World War II Soviet solid-propellant rocket technology is reviewed. Research and development regarding solid composite preparations of pyroxyline TNT powder is described, as well as early work on rocket loading calculations, problems of flight stability, and aircraft rocket launching and ground rocket launching capabilities.

  3. Interior Ballistics (Vnutrennyaya Ballistika

    Science.gov (United States)

    1949-01-01

    aaokaWa«, colloidal on a pyroxylin basla, aad aaa obtalaad by aa athyl alcohol coapoaad tr**ta*nt of pyroxylla exploaive eubataace. Tal... problema of laterlor balllatlca» r-TS-7337-U xllll I u »•EWiiiwjmm;"« «Mir» grave eoastaatly, liest«« practical problaaa) valopaaat for...trogen coataat (13.S to 13.79ft). It la however entirely aolable la aa alcohol -ethyl other aistara. Developed by D.I. Bead» leer aa early

  4. Development of a fission track register dry-method for uranium determination in biological and environmental samples; Desenvolvimento do metodo a seco de registro de tracos de fissao a ser empregado na determinacao de uranio em diversos tipos de amostras biologicas e ambientais

    Energy Technology Data Exchange (ETDEWEB)

    Yamazaki, Ione Makiko [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil); Geraldo, Luiz Paulo [Universidade Catolica de Santos (UNISANTOS), SP (Brazil). Instituto de Pesquisas Cientificas

    2002-07-01

    In the present work, it was developed a relatively quick and reproducible method for the determination of uranium content, in the ppb level, to be employed in the study of several biological and environmental samples. The technique employed was the fission-track registration in a polycarbonate plastic sheet, commercially known as Makrofol KG (dry-method), together with an automatic discharge chamber system for fission-track counting, using as electrode an aluminized Mylar foil. 5{mu}l droplet of the standard sample solutions, in the form of uranyl nitrate, with U concentrations ranging from 12x10{sup -6} to 50x10{sup -6} g/l, were deposited on Makrofol KG plastic foils, together with 2{mu}l of a 1% cyastat solution (wetting agent), in order to reduce the droplet surface tension. During the deposition, the whole droplet was carefully scattered in such way that large deposit areas, around 7cm{sup 2} were obtained. After evaporation (7 minutes) under a bulb lamp (250 W), the samples were covered by an extremely thin layer (20 {mu}g/cm{sup 2}) of collodion (pyroxylin) in order to fix the dried deposits on the plastic foils. Sets of 12 piled up samples were simultaneously irradiated with neutrons produced by the IPEN IEA-R1 reactor, a 2 MW pool type research reactor. The calibration curve obtained is presented with a discussion of the experimental uncertainties involved. (author)