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  • 1
    Electronic Resource
    Electronic Resource
    Use of Chelex-100 to maintain constant metal activity and application to characterization of metal complexation (1982)
    s.l. : American Chemical Society
    Analytical chemistry 54 (1982), S. 1633-1637 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00246a038
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  • 2
    Electronic Resource
    Electronic Resource
    Modeling the self-sustained discharge-excited XeCl laser in two dimensions (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2113-2122 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new two-dimensional model for transverse discharge-excited gas lasers is described. The model can compute accurate electric fields for complex geometries. This facility is exploited to investigate the effect of the discharge electrode profile on XeCl laser performance. It is found that any of the stock electrode designs is satisfactory for high-efficiency lasers with excitation pulses lasting for up to 200 ns. For longer-pulse lasers, the pulse length and energy output are sensitive to the choice of electrode and there are grounds for preferring the Stappaerts profile over the other available designs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351133
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  • 3
    Electronic Resource
    Electronic Resource
    End-evaporation kinetics in living-polymer systems (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 7260-7266 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study theoretically the process of "end-evaporation'' in living polymer systems, such as wormlike surfactant micelles. End-evaporation occurs when single monomers either break away from, or join onto, a chain end, the rates being described by the (mean-field) rate constants k and k', respectively. Thus the chains can exchange material with one-another via a bath of free monomers. The relaxation of a system of living polymers after a small temperature jump (T-jump) is studied theoretically. The effect of a T-jump is to prepare the system with the wrong mean chain length, which relaxes to its equilibrium value L¯ by end-evaporation. It is found that the number of free monomers in the system relaxes almost completely in a time of order 1/kL¯, while the weight-average chain length, which is the quantity measured in light scattering experiments, relaxes on a time scale τD=4L¯2/k, which is three powers of L¯ longer. We also predict that the stress relaxation after a step strain is dominated by end-evaporation whenever τD(approximately-less-than)τrep, where τrep is the reptation (disengagement) time for a chain of length L¯. In this case the stress relaxation is found to be "stretched exponential'' for times smaller than τD and single exponential for longer times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465419
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  • 4
    Electronic Resource
    Electronic Resource
    Introduction to Biocatalysis, Using Enzymes and Microorganisms. (1996)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 43 (1996), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1996.tb04500.x
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  • 5
    Electronic Resource
    Electronic Resource
    Electromagnetic shock-wave generation in a lumped element delay line containing nonlinear ferroelectric capacitors (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2471-2473 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-voltage waveforms with rise times of 50 ns were produced by electromagnetic shock-wave generation in a uniform, lumped element delay line constructed with nonlinear, ferroelectric capacitors. A close correlation was found between the experimental voltage waveforms observed at different positions along the delay line and those predicted by a numerical computer code.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102907
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  • 6
    Electronic Resource
    Electronic Resource
    Anomalous skin effect and collisionless power dissipation in inductively coupled discharges (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3580-3589 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article we present an experimental study of the electron electrodynamics in an inductively coupled argon discharge. The discharge is configured in a re-entrant geometry and operates in the stochastic heating regime at pressures below 10 mTorr. The radial distribution of the induced rf electric field E and current density J were determined for a wide range of plasma parameters in argon gas from the measurement of the radial distribution of the magnetic field components and its spatial derivatives. The results show an anomalous skin effect at low pressure and high plasma densities that is characterized by a nonmonotonic spatial decay of the electromagnetic field E and current density J along with phase reversal and bifurcation of E and J and negative power absorption regions. These features are interpreted to be a result of nonlocal electrodynamics due to the electron thermal motion (which causes spatial dispersion in the conductivity). The electron thermal motion in the inhomogeneous rf induced electric field induces a phase randomization that leads to collisionless heating. The relative ratio of ohmic collisional heating to collisionless heating is estimated by comparing the total and collisional (deduced from an estimation of the electron-neutral collision frequency) power fluxes absorbed by the plasma electrons. This shows that collisionless heating dominates ohmic heating for pressures below 5 m Torr. These results are compared with the previously published work of Godyak et al. [V. A. Godyak, R. B. Piejak, and B. M. Alexandrovich, Phys. Rev. Lett. 80, 3264 (1998)] and show a surprisingly good agreement (at constant gas pressure and plasma density) despite the differing chamber geometry. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1316791
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  • 7
    Electronic Resource
    Electronic Resource
    Relations between preionization density distribution, electrode design, and efficiency in high-pressure discharge-excited gas lasers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2866-2868 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Certain types of discharge-excited gas lasers are routinely operated at pressures of 1 atm or more; these high-pressure glow discharges are formed using preionization, which is effective only when uniform and of adequate density. Using experiments and a two-dimensional discharge model, this letter shows that even when these requirements are met, preionization that strays outside the active volume can reduce the laser efficiency by as much as 40%. The use of wide, smoothly contoured electrodes—such as are used in conjunction with high-speed gas flow in high average power lasers—exacerbates this problem. It is therefore important to ensure that preionization is restricted to the active volume of the laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110308
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  • 8
    Electronic Resource
    Electronic Resource
    Measured and simulated electron energy distribution functions in a low-pressure radio frequency discharge in argon (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 3247-3249 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a combined experimental and computational study of a low-pressure radio frequency discharge in argon. We have determined the electron energy distribution function experimentally using a Langmuir probe system and by simulation using the particle in cell method. A close comparison of these data shows good agreement over pressures from 20 to 200 mTorr. This pressure range encompasses the putative transition from a stochastic to an ohmic electron heating mode [V. A. Godyak and R. B. Piejak, Phys. Rev. Lett. 65, 996 (1990)]. The simulation does show such a transition, and we agree with earlier estimates of the transition pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109088
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  • 9
    Electronic Resource
    Electronic Resource
    STUDIES ON HYPOXIA. VI. CHANGES IN LYMPHOCYTES AND TRANSITIONAL CELLS IN THE MARROW DURING THE INTENSIFICATION OF PRIMARY HYPOXIA AND REBOUND (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 149 (1968), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1968.tb15151.x
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  • 10
    Electronic Resource
    Electronic Resource
    Eigenvalues associated with relaxed states of toroidal plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3186-3195 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the theory of relaxed states of toroidal plasmas certain eigenvalues of the equation ∇×B=μB play a crucial role. These eigenvalues are associated with vanishing toroidal flux and determine the onset of current limitation in a toroidal discharge. In axisymmetric systems there are both periodic and axisymmetric eigenfunctions and it is important to know whether the eigenmode associated with the lowest eigenvalue is periodic or axisymmetric. This depends on the shape of the poloidal cross section and determines the nature of the current-limited discharge. The eigenvalues of periodic and axisymmetric modes have been computed in rectangular and elliptical cross sections and in reentrant Multipinch-like cross sections. The reentrant case required new numerical techniques, which are described. It is found that in rectangular and elliptic cross sections the lowest mode is always periodic. However, in the Multipinch a transition occurs in which the lowest eigenmode changes from periodic to axisymmetric as the "waist'' in the cross section is made narrower. The critical width is determined. These calculations suggest that in the GA Multipinch experiment [Nucl. Fusion 26, 255 (1986)] the current saturated discharge should be axisymmetric—unlike all other existing pinch experiments where it is periodic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866494
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