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  • 1
    Electronic Resource
    Electronic Resource
    Polymer degradation in porous media flow (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 2353-2368 
    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 hydrodynamic degradation of high molecular weight poly(acrylamide-co-Na acrylate) in 1M NaCl in porous media flow was studied as a function of polymer concentration in the dilute and semidilute concentration ranges. Porous media rheometry was used to monitor molecular weight changes due to chain scission. At equivalent superficial velocities of flow through a glass bead pack, polymers at dilute concentrations showed greater loss of molecular weight than polymers at semidilute concentrations.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330708
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  • 2
    Electronic Resource
    Electronic Resource
    Stable shell structures in hydrogen-bonded complexes (1991)
    Springer
    The European physical journal 20 (1991), S. 47-51 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 + d ; 82.30.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutral clusters (NH3) n ((CH3)3N) m and (H2O) n ((CH3)3N) m , prepared in a pulsed nozzle supersonic expansion, are ionized by multiphoton ionization and investigated with a reflectron time-of-flight mass spectrometry technique. The observed mixed cluster ions display a maximum intensity atm=2(n+1) whenn ≦ 5 for (NH3) n ·((CH3)3N) m H+ andm=n+2 whenn ≦ 4 for (H2O) n ((CH3)3N) m H+ indicating that the cluster ions with these combinations have a stable closed shell structure. However, the pattern begins to break down whenn〉5 for ammonia system andn〉4 for water system. Thereupon, the most intense peaks are reached with one molecule less than the pattern required, i.e.m=2(n+1)−1 whenn=6 for (NH3) n ((CH3)3N) m H+ andm=(n+2)−1 whenn=5 for (H2O) n ((CH3)3N) m H+. These findings strongly suggest the onset of hydrogen-bonded ring structures from chain-like ones at critical cluster sizes. This is also supported by the studies of the metastable decomposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543935
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  • 3
    Electronic Resource
    Electronic Resource
    Pore-structure optimization of calcium carbonate for enhanced sulfation (1997)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 43 (1997), S. 2323-2335 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A modified CaCO3 sorbent with an open internal pore structure is prepared and its sulfation characteristics are investigated in an entrained flow reactor at high temperatures (900-1,100°C) and short contact times (20-600 ms) using small particle sizes (〈 5 μm). The most distinguishing feature of this modified carbonate (MC) is its 70-75% sulfation conversion within 0.5 s, which is substantially higher than any other sorbents published. The MC is prepared by carbonation-precipitation from a calcium hydroxide suspension by optimizing the operating parameters to generate carbonate particles of the desired pore structural properties. The high initial surface area combined with its open pore structure and pore-size distribution of its calcine contribute to its high reactivity. The calcined MC possesses a significant portion of its pore volume in the 50-200 Å range. This size range represents an optimum pore size for sulfation since it provides a reasonably high surface area and is less susceptible than 〈 50 Å pore sizes, to pore filling, or pore-mouth plugging due to the formation of higher molar volume CaSO4. Investigation with other carbonates reveals that a much higher portion of their calcines' porosity lies in the smaller pores, which leads to premature termination of sulfation. Results show the impact of internal pore structure on initial reactivity and ultimate sorbent conversion.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690430917
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of vinylpyridine irradiation-grafted poly(4-methyl-pentene-1) membrane for oxygen enrichment (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 5763-5775 
    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: By adjusting the casting conditions, the oxygen permeabilities of poly(4-methyl-pentene-1) (TPX) membranes prepared in this study are in the range of 2.91-7.14 × 10-9 cm3(STP) cm/cm2 s cm Hg and permeability ratio of O2/N2 between 2.7 and 4.4. To increase O2—N2 selectivity, the vinylpyridine is γ-ray irradiation-grafted onto the substrate-TPX membrane. The factors that affect the structure and performance of the grafted membrane considered are: tightness of substrate, kind of solvent for grafting monomers, irradiation conditions, total irradiation dose, and operating temperature and pressure. The O2/N2 selectivities of grafted TPX membranes are significantly improved comparing to that of nongrafted TPX membranes. For example, an O2 permeability of 35.6 × 10-10 cm3(STP) cm/cm2 s cm Hg and an O2/N2 permeability ratio of 7.5 for the grafted membrane can be obtained.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320709
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  • 5
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    Investigation of fast-electron-induced Kα x rays in laser-produced blow-off plasma (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-03-25
    Description: Author(s): H. Sawada, M. S. Wei, S. Chawla, A. Morace, K. Akli, T. Yabuuchi, N. Nakanii, M. H. Key, P. K. Patel, A. J. Mackinnon, H. S. McLean, R. B. Stephens, and F. N. Beg Refluxing of fast electrons generated by high-intensity, short-pulse lasers was investigated by measuring electron-induced Kα x rays from a buried tracer layer. Using planar foils of Au/Cu/CH, the 150-J, 0.7-ps TITAN short-pulse laser was focused on the gold foil to generate fast electrons and the 3... [Phys. Rev. E 89, 033105] Published Mon Mar 24, 2014
    Keywords: Plasma Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-11-08
    Description: Author(s): J. Peebles, A. V. Arefiev, S. Zhang, C. McGuffey, M. Spinks, J. Gordon, E. W. Gaul, G. Dyer, M. Martinez, M. E. Donovan, T. Ditmire, J. Park, H. Chen, H. S. McLean, M. S. Wei, S. I. Krasheninnikov, and F. N. Beg The physics governing electron acceleration by a relativistically intense laser is not confined to the critical density surface; it also pervades the subcritical plasma in front of the target. Here particles can gain many times the ponderomotive energy from the overlying laser and strong fields can ... [Phys. Rev. E 98, 053202] Published Wed Nov 07, 2018
    Keywords: Plasma Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Channel optimization of high-intensity laser beams in millimeter-scale plasmas (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-04-21
    Description: Author(s): L. Ceurvorst, A. Savin, N. Ratan, M. F. Kasim, J. Sadler, P. A. Norreys, H. Habara, K. A. Tanaka, S. Zhang, M. S. Wei, S. Ivancic, D. H. Froula, and W. Theobald Channeling experiments were performed at the OMEGA EP facility using relativistic intensity ( 〉 10 18 W / cm 2 ) kilojoule laser pulses through large density scale length ( ∼ 390 – 570   μ m ) laser-produced plasmas, demonstrating the effects of the pulse's focal location and intensity as well as the plasma's te... [Phys. Rev. E 97, 043208] Published Fri Apr 20, 2018
    Keywords: Plasma Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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