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  • 21
    Electronic Resource
    Electronic Resource
    Synthesis and central nervous system activity of quinazolones related to 2-methyl-3-(o-tolyl)-4(3H)-quinazolone (methaqualone) (1977)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 20 (1977), S. 379-386 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00213a013
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  • 22
    Electronic Resource
    Electronic Resource
    Central nervous system activity of a novel class of annelated 1,4-benzodiazepines, aminomethylene-2,4-dihydro-1H-imidazo[1,2-a][1,4]benzodiazepin-1-ones (1977)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 20 (1977), S. 1035-1041 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00218a009
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  • 23
    Electronic Resource
    Electronic Resource
    Relaxation revisited : The 41st annual meeting of the division of plasma physics of the american physical society (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1623-1629 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Relaxation is the result of turbulence in a plasma that behaves essentially as an ideal conducting fluid, but has a small resistivity and viscosity. These small effects are locally enhanced by the turbulence and lead to reconnection of magnetic field lines. This destroys an infinity of topological constraints, leaving only the total magnetic helicity as a valid invariant. The plasma therefore rapidly reaches a specific state of minimum energy. This minimum energy "relaxed state" can be calculated from first principles and has many striking features. These depend on the topology of the system. They include spontaneous field reversal, symmetry-breaking and current limitation in toroidal pinches, and flux generation and flux amplification in Spheromaks. In addition the relaxed states can be controlled and maintained by injection of helicity from an external circuit. These features, and the profiles of the relaxed states themselves, have been verified in many laboratory experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873984
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  • 24
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘Stability of coupled tearing and twisting modes in tokamaks''' [Phys. Plasmas 1, 3308 (1994)] (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3925-3925 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The authors contend that incorrect inferences are drawn by Ding Li regarding the sources of error and of the basis function method used in the calculations of toroidally coupled tearing modes. (AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871024
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  • 25
    Electronic Resource
    Electronic Resource
    Influence of continuous spectrum on ballooning instabilities in plasmas with shear-flow (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 2425-2429 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of shear-flow on stability of plasma ballooning modes is important for Tokamak experiments. In a static plasma, the growth rate of ballooning modes is readily determined using the "ballooning transformation," but this is ineffective for plasmas with flow. One then has only the quasi-static approximation. This gives the growth rate in the limit that shear velocity Ω′→0, but no other information on the effect of shear-flow. Furthermore, it is invalid in typical cases because of the intervention of the stable magnetohydrodynamic continuum. In this paper, a simple model is used to investigate the influence of shear-flow on ballooning modes. This shows that the intervention of the continuum leads to a reduction in the growth rate proportional to |Ω′| for small Ω′. This is in accord with some numerical simulations—but contrary to the (Ω′)2 variation expected from a perturbation expansion. In fact, since the effect is nonanalytic in Ω′, it cannot be obtained from a perturbation expansion in Ω′ and an alternative formalism is first developed for dealing with this problem. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873514
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  • 26
    Electronic Resource
    Electronic Resource
    On transport barriers and low–high mode transitions (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3065-3067 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transport barriers and transitions between modes of low and high confinement in tokamak plasmas are often attributed to suppression of turbulence by a shear flow related to a plasma gradient, e.g., of density. However, such shear flow is also affected by the second derivative of density. When this is introduced there is no unique relation between flux and gradient—it depends on the source distribution within the plasma and on conditions at the plasma edge (e.g., imposed by the scrape-off layer). This edge gradient must lie within prescribed limits if a stationary plasma profile (which may include an improved confinement zone) is to exist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873029
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  • 27
    Electronic Resource
    Electronic Resource
    Resistive wall modes and nonuniform wall rotation (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 4062-4072 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The resistive wall mode (RWM) poses a threat to many plasma confinement devices. The continuous rotation of the wall relative to the plasma makes it appear perfectly conducting, because of the skin effect, but this is ineffective if the perturbation locks to the wall. This raises the question of whether a nonuniformly rotating wall is more effective. In this paper we discuss the effect of such nonuniform wall rotation, in both the toroidal and poloidal directions, on resonant and nonresonant RWMs. In the case of toroidal rotation it is shown that at large wall velocity both the resonant and nonresonant RWMs are stabilized, even though the nonresonant mode rotates with the maximum wall velocity. In the case of poloidal rotation RWMs do not lock to the wall and have a complicated behavior at intermediate velocities. However they are again stabilized by large wall velocity. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388035
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  • 28
    Electronic Resource
    Electronic Resource
    A flexible data acquisition system for timing pulsars (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3551-3555 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a flexible, inexpensive data acquisition system built for high-precision timing observations of pulsars. The system is designed to interface with a wide variety of radio telescope receiver back ends; it permits standardized measurement techniques and data formats in work carried out at a number of different observatories. Copies of the basic "Mark III'' system are now in regular use at the Arecibo Observatory, Green Bank, and the Very Large Array. We describe the specifications, hardware, and software implementation of the system, and briefly outline some of its current applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143763
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  • 29
    Electronic Resource
    Electronic Resource
    An out-of-plane detector for surface x-ray diffraction (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2658-2659 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An out-of-plane detector movement has been built for the detector arm of the surface x-ray diffractometer on the wiggler beam line 9.4 on the synchrotron radiation source at Daresbury Lab. For a relative small cost, it significantly increases the volume of reciprocal space that can be accessed with a corresponding improvement in the accuracy of the determination of the interatomic spacings. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147188
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  • 30
    Electronic Resource
    Electronic Resource
    Bracken encroachment rates in Britain (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 1 (1985), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. The bracken fern (Pteridium aquilinum (L.) Kuhn) is emerging as the most successful of international weeds. Tolerant, yet aggressive and opportunist, it follows characteristically in the wake of evacuated settlement, deforestation or reduced biotic pressures. It is hostile to many other plants and to animals, and generates toxins including some carcinogens. It appears to be extending its range into wet and exposed habitats and at its climatic limits. Estimated encroachment rates in the UK average 1%, sometimes 3% per annum, which appears to be unprecedented. Its historical use as an occasional resource, e.g. for litter, bedding, roofing, etc, has mostly ceased. It is now a major source of land loss and land pollution. More work is needed (and is pending) to calibrate bracken spread more precisely, e.g. from satellite imagery. The reclamation of bracken-infested land is probably more cost-beneficial per hectare than the reclamation of wetland or heathland, taking any time-scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.1985.tb00656.x
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