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  • 1
    Electronic Resource
    Electronic Resource
    A Lagrangian formalism for the Einstein–Yang–Mills equations (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 3733-3742 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A new action principle, in the which the field variables are a sl(2,C)⊕g valued connection one-form, two-form, and multiplier field, is proposed and discussed. The equations of motion are the complex Einstein–Yang–Mills equations with internal symmetry Lie algebra g. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531356
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  • 2
    Electronic Resource
    Electronic Resource
    The real geometry of holomorphic four-metrics (2002)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 43 (2002), S. 2015-2028 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The real geometry of holomorphic four-metrics is investigated. The almost product and complex structures, associated with the real eight-metrics corresponding to the real and imaginary parts of the holomorphic metrics, are studied. It is shown that half-flat holomorphic metrics, and the corresponding real eight-metrics, are associated with integrable almost product, complex and hyper-Kähler structures. Real and complex local coordinate descriptions are presented. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456947
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the Electron Temperature by Thomson Scattering in Tokamak T3 (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 488-490 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Electron temperatures of 100 eV up to 1 keV and densities in the range 1–3 × 1013 cm−3 have been measured by Thomson scattering on Tokamak T3. These results agree with those obtained by other techniques where direct comparison has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224488a0
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  • 4
    Electronic Resource
    Electronic Resource
    Magneto-hydro-dynamic limits in spherical tokamaks : The 40th annual meeting of the division of plasma physics of the american physical society (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1958-1968 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The operational limits observed in spherical tokamaks, notably the small tight aspect ratio tokamak (START) device [A. Sykes et al., Nucl. Fusion 32, 694 (1992)], are consistent with those found in conventional aspect ratio tokamaks. In particular the highest β achieved (∼40%) is consistent with an ideal magneto-hydro-dynamic (MHD) Troyon type limit, the upper limit on density is well described by the Greenwald density (πa2n¯e/Ip∼1) and the normalized current (Ip/aBt) is limited such that q95(approximately-greater-than)2. Stability calculations indicate scope for increasing both normalized β and normalized current beyond the values so far achieved, although wall stabilization is generally needed for low-n modes. In double null configurations current terminating disruptions occur at each of the operational boundaries, though the current quench tends to be slow at the density limit and disruptions at high β may be due to the low q. In early limiter START discharges, before the divertor coils were installed, disruptions rarely occurred. Instead internal reconnection events which have all the characteristics of a disruption except the current quench occurred. These various disruptive behaviors are explained in terms of a model in which helicity is conserved during the disruption. Due to the low toroidal field beam ions in START, and α particles in a ST power plant, are super-Alfvénic. This gives the possibility for toroidal Alfvén eigenmodes (TAEs) to occur and such modes are frequently observed in START neutral beam injection (NBI) discharges, but seem to be benign. The features of these observed TAEs are shown to be in agreement with MHD calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873493
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  • 5
    Electronic Resource
    Electronic Resource
    The small tight aspect ratio tokamak experiment (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2481-2484 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-aspect-ratio tokamaks offer both the economic advantage of smaller size and a number of physics advantages which are not available at conventional aspect ratio. The Small Tight Aspect Ratio Tokamak (START) [Fusion Technology 1990, edited by B. E. Keen, M. Huguet, and R. Hemsworth (North-Holland, Amsterdam, 1991), Vol. 1, p. 353] was conceived as a first substantial test of tokamak plasma behavior at low aspect ratio. It has achieved plasma currents up to 200 kA, peak densities of ∼2×1020 m−3 and central electron temperatures of ∼500 eV at an aspect ratio of 1.3–1.5. Central beta values of ∼13% have been measured and the volume-averaged beta 〈β〉 can approach the Troyon limit. Plasmas are naturally elongated (κ(approximately-less-than)2.0) and are vertically stable without feedback control. Major disruptions have not been observed at low aspect ratios (A≤2.0).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860732
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  • 6
    Electronic Resource
    Electronic Resource
    Four-dimensional conformal and quaternionic structures (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 1259-1262 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The relationship between almost (complex) quaternionic and conformal structures on four-dimensional manifolds is exhibited. Its use in the investigation of the conformal structure of space-time is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529323
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  • 7
    Electronic Resource
    Electronic Resource
    The Clinical and Epidemiologic Features of Tropical Ulcer (Tropical Phagedenic Ulcer) (1988)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of dermatology 27 (1988), S. 0 
    Details
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: : A comparative survey of patients with tropical ulcer has been carried out in Zambia, Gambia, Southern India and Papua New Guinea. The clinical features, socioeconomic background and nutritional correlates have been compared in 170 patients. In 96% of cases the condition occurred on the foot or lower leg. In only 70 instances did the ulcer last for over six months. There was one patient with a squamous cell carcinoma arising in situ from the ulcer margin. No significant differences in clinical features were seen in the countries surveyed. In all areas apart from southern India most cases were seen in the rural population and in children or teenagers. There was no correlation between the development of an ulcer and nutritional status found in this survey. Evidence is presented that there is an association between tropical ulcer and exposure to mud or slow moving fresh water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-4362.1988.tb02339.x
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  • 8
    Electronic Resource
    Electronic Resource
    Chloroplast development in low light-grown barley seedlings (1982)
    Springer
    Planta 154 (1982), S. 259-265 
    Details
    ISSN: 1432-2048
    Keywords: Amyloplast ; Chloroplast development ; Hordeum ; Starch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Segments of 7-d low light-grown barley laminae cut at 0.5 cm intervals up from the intercalary meristem were examined ultrastructurally and biochemically. The different regions upwards showed the succession of plastid development in light-grown tissues of eoplasts, amyloplasts, amoeboid, immature and mature plastids as described by Whatley (1977). Semi-crystalline bodies were detected in all of them. The eoplast-amyloplast regions are characterised by a greater proportion of mitochondria and high levels of ATP and 3-phosphoglyceric acid, together with low levels of inorganic phosphate conducive to the activation of ADP glucose pyrophosphorylase. The amoeboid and immature plastid regions have higher levels of inhibitory phosphate and starch breakdown may be responsible for the release of metabolites and energy for development. Segments containing amoeboid and immature plastids also have reduced levels of ATP (and 3-phosphoglyceric acid) as photosynthetic components are synthesised. Using ultrastructural assessments of areas of thylakoids, first β-carotene and violaxanthin, followed by chlorophyll a and lutein and, lastly, chlorophyll b are concentrated in the developing lamellar systems of the immature and mature chloroplasts. The formation of additional membraneous material which spreads these pigment systems over a greater thylakoid area within the plastids is the final stage of plastid morphogenesis in low light-grown seedlings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387872
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  • 9
    Electronic Resource
    Electronic Resource
    A simple proof of the generalization of Israel's theorem (1977)
    Springer
    General relativity and gravitation 8 (1977), S. 695-698 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple proof of the generalization of the theorem of Israel concerning the uniqueness of the Schwarzschild black hole is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756322
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  • 10
    Electronic Resource
    Electronic Resource
    Differential forms, spin-3/2 fields and Einstein's equations (1995)
    Springer
    General relativity and gravitation 27 (1995), S. 679-689 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The relationship between Einstein's vacuum field equations and classical spin-3/2 field equations is re-explored using two-component spinor valued differential forms. One-form and two-form expressions for spin-3/2 fields and their field equations are considered and a Lagrangian formulation is presented. Complex structures defined by spin-3/2 fields are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02108070
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