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  • LUNAR AND PLANETARY EXPLORATION  (15)
  • Polymer and Materials Science  (5)
  • 2000-2004
  • 1990-1994  (20)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Water-soluble polyamides as potential drug carriers. VIII. Poly(alkylene oxide)-grafted polyaspartamides bearing ethylenediamine side-group functionsPresented in part at the Fourth International Symposium on Macromolecule-Metal Complexes, September 30-October 5, 1991, Siena, Italy. For part VII of this series, see Ref. 18. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 54 (1994), S. 57-63 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In continuation of previous investigations of aspartamide-type polymers as drug carriers, polyaspartamides featuring hydrosolubilizing poly(alkylene oxide) side chains in addition to ethylenediamine side-group functions as potential drug-binding sites are synthesized from poly-D,L-succinimide by successive aminolytic ring-opening steps. Yields are in the range of 45-55%. Depending on selected feed ratios, the target polymers contain both the poly(alkylene oxide) and the ethylenediamine groups in systematically varied proportions. Compositions are determined microanalytically and from relative band intensities of the 1H-NMR spectra. The polymers dissolve smoothly and completely in aqueous media and thus fulfill the major design requirement of water solubility. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070540106
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Graft copolymers from modified ethylene/vinyl acetate copolymers, 2Part 1: cf. ref.7. Synthesis of polystyrene-grafted poly[ethylene-co-(vinyl acetate)] and evaluation of its compatibilizing effect in polystyrene/poly[ethylene-co-(vinyl acetate)] blends (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 3149-3157 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polystyrene-grafted poly[ethylene-co-(vinyl acetate)] (EVA-g-PS) has been synthesized from functionalized polystyrene containing acyl chloride end group (PS-COCl) and partly (5%) hydrolyzed poly[ethylene-co-(vinyl acetate)] (EVALVA-5%). The graft efficiency is ca. 100% when low-molecular-weight polystyrene is employed. By increasing the molecular weight of the grafts the efficiency decreases. These graft copolymers have been used for compatibilizing polystyrene (PS)/poly[ethylene-co-(vinyl acetate)] (EVA) blends. The ability of the copolymers as compatibilizing agent has been verified by an analysis of the mechanical properties and by scanning electron microscopy.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950913
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  • 3
    Electronic Resource
    Electronic Resource
    Graft copolymers from modified ethylene-vinyl acetate (EVA) copolymer. I. Synthesis of poly(ethylene-co-vinyl acetate-g-styrene) using EVA modified by mercaptoacetic acid as chain transfer agent (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 47 (1993), S. 1411-1418 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The modification of the poly(ethylene-co-vinyl acetate) (EVA) by direct esterification of its ethylene - vinyl alcohol copolymer with mercaptoacetic acid was carried out. The amount of the mercaptan group was controlled to avoid gel formation during the graft polymerization with styrene by chain transfer. The chain transfer constant (Cs) of the SH groups and graft efficiency were measured. These graft copolymers were evaluated as a blend compatibilizer. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070470812
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  • 4
    Electronic Resource
    Electronic Resource
    Differential effects of eight metal ions on lymphocyte differentiation antigens in vitro (1990)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 24 (1990), S. 1059-1068 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: In vitro studies were conducted to determine the effects of metal ions known to be released from metallic implants in vivo on the expression of lymphocyte surface antigens. Normal human peripheral blood lymphocytes were exposed to various concentrations of metal ions (Fe3+, Ni2+, Co2+, Mo6+, V5+, Cr6+, Cr3+, and Ti3+) for 30 min at 37°C in a 5% CO2 atmosphere, and then analyzed for their ability to form rosettes with sheep red blood cells. Following this preliminary analysis, lymphocytes were exposed to the metal ions found to inhibit the E-rosette reaction (Fe3+, Ni2+, and Co2+) in order to determine which of the following surface antigens were affected: CD2, CD3, CD4, CD8, CD1, CD22, CD10, and HLA-DR. Our results showed that the in vitro treatment of lymphocytes with Fe3+ or Co2+ caused inhibition of CD2 only, whereas Ni2+ caused inhibition of both CD2 and CD3 antigens. These findings suggest that Fe3+, Co2+, and Ni2+ ions may interfere with T cell activation since both CD2 and CD3 are involved in that process.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820240808
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  • 5
    Electronic Resource
    Electronic Resource
    Pretreatments of improve the adhesion of electrodeposits on aluminium (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 17 (1991), S. 519-528 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Aluminium is generally regarded as a metal that is difficult to plate. By using a pretreatment sequence, which includes immersion in a zincate solution, it is possible to electroplate aluminium successfully, although adhesion levels are not always very high. Zincate solutions modified by the addition of various ions have been shown to promote adhesion. Using one such solution, an investigation has been carried out as to how, by modifying the pretreatment sequence, the adhesion on electrodeposits on aluminium can be improved. Such modifications included varying the etch procedures and using the so-called double dip technique. Some of the factors giving rise to the improved adhesion of electrodeposits have been investigated by SEM, AES, SIMS, ESCA, EPMA and AAS.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740170720
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  • 6
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    A Study of Saturn's E-Ring Particles Using the Voyager 1 Plasma Wave Instrument (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The flyby of Voyager 1 at Saturn resulted in the detection of a large variety of plasma waves, e.g., chorus, hiss, and electron cyclotron harmonics. Just before the outbound equator crossing, at about 6.1 R(sub s), the Voyager 1 plasma wave instrument detected a strong, well-defined low-frequency enhancement. Initially it was suggested that plasma waves might be responsible for the spectral feature but more recently dust was suggested as at least a partial contributor to the enhancement. In this report we present evidence which supports the conclusion that dust contributes to the low-frequency enhancement. A new method has been used to derive the dust impact rate. The method relies mainly on the 16-channel spectrum analyzer data. The few wide band waveform observations available (which have been used to study dust impacts during the Voyager 2 ring plane crossing) were useful for calibrating the impact rate from the spectrum analyzer data. The mass and, hence, the size of the dust particles were also obtained by analyzing the response of the plasma wave spectrum analyzer. The results show that the region sampled by Voyager 1 is populated by dust particles that have rms masses of up to few times 10(exp -11) g and sizes of up to a few microns. The dust particle number density is on the order of 10(exp -3) m(exp 3). The optical depth of the region sampled by the spacecraft is 1.04 x 10(exp -6). The particle population is centered about 2500 km south of the equatorial plane and has a north-south thickness of about 4000 km. Possible sources of these particles are the moons Enceladus and Tethys whose orbits lie within the E-ring radial extent. These results are in reasonable agreement with photometric studies and numerical simulations.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-194694 , NAS 1.26:194694 , U-OF-IOWA-93-19
    Format: application/pdf
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  • 7
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    Plasma wave observations at Neptune (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Phenomena detected by the plasma wave instrument during the Voyager 2 flyby of Neptune are reviewed. Particular attention given to radio emissions, electron plasma oscillations in the solar wind upstream of the bow shock, electrostatic electron cyclotron waves and upper hybrid resonance (UHR) waves, whistler mode noise, and dust impacts. The radio emissions which occur in a broad range of about 5 to 50 kHz are considered to be generated by mode conversion from UHR waves at the magnetic equator. The inner magnetosphere has relatively low plasma wave intensities (less than 100 microV/m). Many small micron-sized dust particles which were detected striking the spacecraft had the maximum impact rate of about 280 impacts per sec at the bound ring plane crossing, and about 110 impacts per sec at the outbound ring plane crossing. Most of the particles were concentrated in a dense disk, about one thousand km thick, near the equatorial plane.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 12; 11
    Format: text
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  • 8
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    Heavy ion dynamics and auroral arc formation in the Jovian magnetosphere (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: This paper gives a brief review of some of the current controversial issues surrounding the Jovian aurora. In particular, the manner of its excitation be it that of electron or heavy ion precipitation is examined critically in the context of proposed models for magnetospheric dynamics, particle energization, and auroral energy input. A model for the X-ray aurora based on bremsstrahlung by a primary electron beam and its ionization secondaries is high-lighted and the connection to the outward magnetospheric transport of heavy ion plasma from the satellite Io is made.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 12; 8 Au
    Format: text
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  • 9
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    On the generation of plasma waves in Saturn's inner magnetosphere (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Voyager 1 plasma wave measurements of Saturn's inner magnetosphere are reviewed with regard to interpretative aspects of the wave spectrum. A comparison of the wave emission profile with the electron plasma frequency obtained from in situ measurements of the thermal ion density shows good agreement with various features in the wave data identified as electrostatic modes and electromagnetic radio waves. Theoretical calculations of the critical flux of superthermal electrons able to generate whistler-mode waves and electrostatic electron cyclotron harmonic waves through a loss-cone instability are presented. The comparison of model results with electron measurements shows excellent agreement, thereby lending support to the conclusion that a moderate perpendicular anisotropy in the hot electron distribution is present in the equatorial region of L = 5-8.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A6; p. 9351-9356.
    Format: text
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  • 10
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    Thermal structure of ions and electrons in Saturn's inner magnetosphere (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: A theoretical model of thermal ion and electron temperatures in Saturn's inner magnetospheres is presented which is based on a fast model of radial diffusive plasma transport. It is shown that the ion and electron temperatures and the latitudinal behavior of temperatures are consistent with the fast diffusion hypothesis, assuming that O(+) is the dominant ion and that its source is the Dione-Tethys plasma torus. The present results reinforce the conclusions of Barbosa (1990).
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A6; p. 9335-9343.
    Format: text
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